Statistics, most likely. (And yes, they do.)

see page 199 in this dataset[0] which is the dataset used for this list of countries on Wikipedia[1]. If you sort on Wealth Gini (2019), then Netherlands is ranked first.

0: https://www.credit-suisse.com/media/assets/corporate/docs/ab...

1: https://en.wikipedia.org/wiki/List_of_countries_by_wealth_eq...