| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 849 | 4 |
| 2015 | 993 | 5 |
| 2014 | 1136 | 5 |
| 2013 | 1069 | 6 |
| 2012 | 1004 | 6 |
| 2011 | 907 | 6 |
| 2010 | 868 | 6 |
| 2009 | 617 | 6 |
| 2008 | 673 | 6 |
| 2007 | 537 | 6 |
| 2006 | 462 | 7 |
| 2005 | 364 | 10 |
| 2004 | 294 | 11 |
| 2003 | 280 | 11 |
| 2002 | 278 | 8 |
| 2001 | 143 | 17 |
| 2000 | 117 | 21 |
| 1999 | 122 | 20 |
| 1998 | 120 | 22 |
| 1997 | 118 | 24 |
| 1996 | 105 | 26 |
| 1995 | 88 | 27 |
| 1994 | 67 | 27 |
| 1993 | 51 | 32 |
| 1992 | 77 | 24 |
| 1991 | 81 | 22 |
| 1990 | 92 | 23 |
| 1989 | 74 | 20 |
| 1988 | 91 | 17 |
| 1987 | 84 | 15 |
| 1986 | 77 | 13 |