Risky government decisions, a potential global trade war, and a dependency on natural resources are just some of the reasons why some countries are set to experience a nosedive in their wealth. Using the FocusEconomics Consensus Forecast for nominal GDP per capita, we look at the countries it predicts are set to get poorer over the next four years and why.

While Switzerland is currently the 2nd richest country in the world, it is set to fall down the rankings, slipping to fifth richest by 2022.

Why? Economic uncertainty has been caused by a massive overhaul of the Swiss corporate tax system, which saw the population vote against proposed solutions, after the EU called on the country to change its ‘harmful’ tax practices.

Financial instability has also been blamed for an ongoing debate on pension funds, as the welfare system struggles to deal with an ever-increasing population. Along with the weakening of the Swiss Franc, and the EU constraints on the Swiss National Bank, the country is going to have to work hard to solve these issues if it wants to regain its place as one of the wealthiest countries in the world.

Despite a mostly recovered stock market, the US is predicted to drop from being the 6th to the 8th richest country in the world by 2022, based on its GDP per capita. President Trump’s plan to grow the US economy at a rate of knots has some economists predicting a boom and bust situation, which could see the country back in recession by 2020.

President Trump’s defiant trade agenda, with tariffs imposed on steel and aluminium imports, is predicted to backfire on the US economy long term, causing financial damage and job losses.

One such casualty is US company Harley Davidson, which has announced it's moving some production out of America due to the recent EU retaliatory tariffs on US motorcycles. The EU tariffs were a response to the US duties on steel and aluminium imports.

South Korea has long been a high-tech, service-based economy which thrives on its exports, namely cars and technology, with Samsung, Hyundai and Kia being just some of Korea’s most successful exporters. In fact, more than 40% of the country’s GDP comes from its exports, and this reliance is set to harm the economy.

In April of this year, South Korean exports were shown to be in decline because of falling global demand. As a result, this is causing a downturn in its manufacturing sector.

What's more, the ping-pong trade situation between China and the US is set to damage South Korea’s economy and further weaken its exports. Youth unemployment and rising house prices also on the list of problems and the next four years will see the country drop two places in the GDP world rankings, according to FocusEconomics, from 26th to 28th richest.

Saudi Arabia possesses about 16% of the world's proven petroleum reserves, which accounts for a mammoth 42% of its own GDP. However, an international oil cap deal has seen a reduction in oil output that will continue to put a strain on the country’s economy.

An ongoing effort to crackdown on mass corruption has also reported to have unsettled the economic landscape. By 2022, the kingdom is due to fall from 38th to 41st in the world rankings of richest countries.

Oman has long been reliant on its oil industry but this is in steep decline, with some predicting its oil reserves will dry up in as little as 45 years from now.

The country is focussing on diversification, but the objective of reducing the oil sector’s contribution to GDP from 46% in 2017 down to 9% by 2020 is an ambitious one. Coupled with the country's high unemployment rates, Oman is looking at challenging times ahead, dropping from 44th down to 50th richest country by 2022.

The falling price of crude oil and the weakening of the Russian Rouble have been at the centre of Russia’s economic problems in the last few years and its impact continues to threaten the country’s financial stability.

Western sanctions in response to Moscow’s annexation of Crimea and its involvement in Ukraine have limited international funding for Russian companies and isolated the country from some of the world's biggest economies.

Low wages and a high poverty rate look also look set to continue. By 2022, Russia is predicted to drop from 53rd to 56th richest country in the world.

Brazil entered into the worst recession in its history in 2015 with GDP falling by 3.8% and it has still not recovered. Despite a large economy, with natural resources and global exports such as sugar and coffee, the country is fighting inherent political and social problems.

Uneven distribution of wealth, a spike in criminal violence and widespread corruption are set to cause the country to become poorer, going from 58th richest country to 62nd by 2022.

It has the largest stock exchange in Africa and an abundant supply of natural resources, but South Africa is plagued by economic troubles that are getting worse.

A report by South Africa’s Treasury in October 2017 predicted that the gross loan debt is expected to reach $247 billion (£187bn) in 2020 as the government steps up borrowing. Internationally, South Africa’s continued political instability make it a risky country to invest in, while inequality remains widespread. FocusEconomics says it will fall from 71st richest country to 73rd by 2022.

Unlike some of its neighbours, Jordan does not have huge amounts of natural resources to prop up its economy. Instead the country’s wealth is driven by its financial services and tourism, both of which have experienced problems in recent years.

The refugee crisis since the the onset of the civil war in Syria has posed socioeconomic challenges for Jordan and, as of early 2016, Jordan’s own official census estimated the refugee number at 1.3 million. The country is predicted to fall from 75th richest to 77th by 2022.