Retail Space Per Capita

I notice a contrast of space when I go to the U.S.  The footprint of malls seems to be much larger than in Canada.  There's more parking lot, loading docks, grass around the boulevards, etc.   Robin Lewis of Forbes/Retail wrote in 2014 that America was on the edge of the Great Retail Demassification.   There is 46 square feet of retail space per capita in the U.S. In the UK there is 9 square feet of retail space per capita. A Financial Post article says that there are 2,370 square feet for every 100 people in the U.S. compared to 1,453 square feet per person in Canada. This leads into the largest malls in the world:  the largest is in China - the New South China Mall is 6.46 million sq. ft. In comparison the West Edmonton Mall is 3.77 million sq. ft It makes me wonder what is the garden space per person in countries around the world.