| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2011 | 312.2 | 92 |
| 2010 | 572 | 71 |
| 2009 | 526.8 | 70 |
| 2008 | 492.1 | 74 |
| 2007 | 383.7 | 77 |
| 2006 | 300.9 | 77 |
| 2005 | 300.2 | 71 |
| 2004 | 227.3 | 75 |
| 2003 | 199.6 | 74 |
| 2002 | 183 | 71 |
| 2001 | 307.3 | 60 |
| 2000 | 314.4 | 56 |
| 1999 | 339.5 | 54 |
| 1998 | 276.6 | 60 |
| 1997 | 291.8 | 57 |
| 1996 | 265.6 | 59 |
| 1995 | 238.2 | 61 |
| 1994 | 283.5 | 56 |
| 1993 | 316.7 | 54 |
| 1992 | 321.5 | 52 |
| 1991 | 310.1 | 51 |
| 1990 | 264.3 | 55 |