The world has changed since 1973.
http://en.wikipedia.org/wiki/List_of_most_charitable_countries
DISCLAIMER: I am not a hate-America-first cheerleader. I love America, I just want to be clear that not everything that was true in 1973 is true today. Japanese technology now includes some of the most advanced industrial robots in the world. Japanese high-speed trains are world renowned. Here in 2010, no one says, "when you say Japanese technology, I think of radios."
You say, I am not a hate-America-first cheerleader. Oh?
I prefer these stats from your website; we could probably add private $$'s too to make it even more lopsided.
1. United States - $28.67 billion
2. France - $12.43 billion
3. Germany - $11.98 billion
4. United Kingdom - $11.50 billion
5. Japan - $9.48 billion
6. Spain - $6.57 billion
7. Netherlands - $6.43 billion
8. Sweden - $4.55 billion
9. Norway - $4.09 billion
10. Canada - $4.01 billion
11. Italy - $3.31 billion
12. Denmark - $2.81 billion
13. Australia - $2.76 billion
14. Belgium - $2.60 billion
15. Switzerland - $2.31 billion
16. Finland - $1.29 billion
17. Austria - $1.15 billion
18. Ireland - $1.00 billion
19. South Korea - $0.82 billion
20. Greece - $0.61 billion
21. Portugal - $0.51 billion
22. Luxembourg - $0.40 billion
23. New Zealand - $0.31 billion