In which countries is cash still the most common payment method?

In which countries is cash still the most common payment method?
Japan is renowned for its punctual and convenient public transport system. But how much of the country does it actually cover?
With COVID restrictions loosening in more and more countries, Europeans might be able to travel again soon. A good moment to have a closer look at the capacity that each area in Europe has to receive tourists.
Real estate prices are at an all-time high in a lot of countries and have increased significantly in the past year. But how much have real estate prices increased in the past year?
Which areas in Europe are the biggest hubs for high-tech, when it comes to employment?
Where in Asia are people the happiest?
Which European countries have the highest and lowest marriage rate?
What portion of each county’s adult population is not getting their average of 7 hours of sleep?
Which alcoholic drink do Europeans prefer?