| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 464 | 10 |
| 2014 | 512 | 10 |
| 2013 | 569 | 9 |
| 2012 | 708 | 7 |
| 2011 | 662 | 9 |
| 2010 | 628 | 8 |
| 2009 | 566 | 7 |
| 2008 | 533 | 9 |
| 2007 | 479 | 9 |
| 2006 | 496 | 4 |
| 2005 | 535 | 4 |
| 2004 | 598 | 4 |
| 2003 | 585 | 4 |
| 2002 | 573 | 4 |
| 2001 | 595 | 4 |
| 2000 | 751 | 4 |
| 1999 | 730 | 4 |
| 1998 | 658 | 4 |
| 1997 | 688 | 4 |
| 1996 | 819 | 3 |
| 1995 | 921 | 2 |
| 1994 | 953 | 2 |
| 1993 | 756 | 2 |
| 1992 | 721 | 3 |
| 1991 | 692 | 4 |
| 1990 | 648 | 4 |
| 1989 | 649 | 4 |
| 1988 | 669 | 3 |
| 1987 | 589 | 3 |
| 1986 | 513 | 3 |