Standings of various countries in terms of GDP

As per International Monetary Fund (2006)

1  United States 13,194,700
2  Japan 4,366,459
3  Germany 2,915,867
4  People's Republic of China 2,644,642
5  United Kingdom 2,398,946
6  France 2,252,213
7  Italy 1,852,585
8  Canada 1,275,273
9  Spain 1,225,750
10  Brazil 1,067,706
11  Russia 984,925
12  South Korea 888,267
13  India 873,659
14  Mexico 840,012
15  Australia 755,659


The interesting part is that since GDP is increased by various factors explained below so, here is a catch...What is a country is expending a lot on its defense or citizens are expending on Medical healthcare...
That might just shoot up their GDP..so its debatable how good a measure of countrys growth is GDP.