| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2013 | 1659 | 24 |
| 2012 | 1722 | 22 |
| 2011 | 1539 | 25 |
| 2010 | 1903 | 19 |
| 2009 | 1346 | 22 |
| 2008 | 1599 | 23 |
| 2007 | 1135 | 26 |
| 2006 | 953 | 25 |
| 2005 | 772 | 27 |
| 2004 | 575 | 33 |
| 2003 | 408 | 37 |
| 2002 | 433 | 31 |
| 2001 | 527 | 25 |
| 2000 | 544 | 25 |
| 1999 | 411 | 30 |
| 1998 | 371 | 31 |
| 1997 | 398 | 31 |
| 1996 | 316 | 33 |
| 1995 | 291 | 34 |
| 1994 | 239 | 30 |
| 1993 | 292 | 26 |
| 1992 | 311 | 26 |
| 1991 | 286 | 27 |
| 1990 | 281 | 29 |
| 1989 | 233 | 26 |
| 1988 | 293 | 19 |
| 1987 | 217 | 23 |
| 1986 | 286 | 15 |