Here's another interesting chart showing which tourists spent the most money in the US in 2013.
http://skift.com/2014/04/09/the-10-tourists-that-spent-the-most-in-the-u-s-in-2013/
Country/Total spent/Millions of visitors/$ spent per visitor
Canada/$27.0 billion/23.39/$1,154
Japan/$18.0 billion/3.73/$4,826
United Kingdom/$13.7 billion/3.84/$3,568
Mexico/$10.5 billion/14.34/$732
Brazil/$10.5 billion/2.06/$5,097
People’s Republic of China/$9.8 billion/1.81/$5,414
Germany $7.5 billion/1.92/$3,906
Australia $6.1 billion/1.21/$5,041
France $5.9 billion/1.5/$3,933
India $5.6 billion/0.86/$6,512
Looking at the figures it's no wonder Disney wants as many Brazilian visitors as they can get. Their average spending was over $5000 per person. How many Americans do you think spend that much on a WDW vacation? Not many, I bet.