1980 | 2011 | |
1 | Soviet Union | Saudi Arabia |
2 | Saudi Arabia | Russia |
3 | USA | USA |
4 | Iraq | Iran |
5 | Venezuela | China |
6 | Mexico | Canada |
7 | China | UAE |
8 | Nigeria | Mexico |
9 | Libya | Kuwait |
10 | Canada | Iraq |
11 | Kuwait | Venezuela |
12 | UAE | Nigeria |
13 | The UK | Brazil |
14 | Indonesia | Norway |
15 | Iran | Kazakhstan |
Prod | 88% | 77% |