59.9% of an economies income can not come from gambling regardless of the popularity of gambling in that country. even when you consider an economy that depends so much on oil, what they get from oil alone is not usually up to that amount, they still depend on other sectors like trade and importation and exportation which plays a crucial part in determining the strength of a countries economy.

The revenue the government gets from the taxation of gambling companies as well as the ones gotten from taxation of gamblers is no doubt huge but is still not enough to measure up to the 59.9% you are asserting.