These 4 European countries still have a wealth tax. Here's how it's working out for them.

Norway's wealth tax was first introduced in 1892. The central government levies a tax rate of 0.15% while municipalities impose a 0.7% rate, bringing the maximum to 0.85%.

Only wealth above 1.48 million krona, or roughly $174,000, is taxed. That figure is doubled for married couples.

A 2012 study from Norwegian researchers reported that average wealth per household totaled 1.6 million krona, or just over $166,000, indicating that most of the population paid some form of the tax.

The amount of revenue generated has largely been the same over the last two decades. The OECD reported the wealth tax constituted 1.1% of all wealth tax revenues in Norway in 2017.

Switzerland first levied a wealth tax in 1840 and its been a pillar of their tax structure since. They're self-reported and paid annually, with no institutional tracking of wealth. Tax authorities can only access personal bank information if a person is suspected of a crime.

The country has a decentralized tax system, and the rate varies around its 26 cantons. But it ranges between 0.3% and 1% of taxpayers' net worth. They tend to be highest in the French-speaking regions of the west and lower in the German-speaking cantons of central Switzerland.

The tax-free threshold for a married couple without children is between 50,000 Swiss francs ($50,370) to 250,000 Swiss francs ($251,856). "The wealth tax thus affects much of the middle class in addition to the wealthiest families," one study on the Swiss wealth tax found.

Compared to the other three European countries, the Swiss wealth tax has generated consistent revenue so far in the 21st century and it brought the largest share. OECD data shows that wealth taxes made up 3.6% of all Swiss tax revenue in 2017, and it's been above 3% since 2000.

Belgium introduced a limited wealth tax on security holdings last year, the Financial Times reported.

The Belgian government enacted a 0.15% tax on the securities accounts of individuals with holdings over €500,000, or $553,000.

The country already had some of the highest tax rates in Europe, though it proved hospitable for French entrepreneurs and businesspeople seeking to park their assets in a neighboring country before Paris eliminated the wealth tax.