| 时间 |
值 （亿美元） |
世界排名 |
| 2012 |
121.2 |
46 |
| 2011 |
156.5 |
47 |
| 2010 |
168.2 |
47 |
| 2009 |
184.7 |
46 |
| 2008 |
372.1 |
42 |
| 2007 |
1366.2 |
31 |
| 2006 |
799.2 |
33 |
| 2005 |
646.9 |
32 |
| 2004 |
442.9 |
32 |
| 2003 |
440.1 |
30 |
| 2002 |
329 |
29 |
| 2001 |
225.3 |
31 |
| 2000 |
144.3 |
35 |
| 1999 |
505.9 |
26 |
| 1998 |
424.4 |
27 |
| 1997 |
162.5 |
35 |
| 1996 |
122.7 |
32 |
| 1995 |
129.9 |
31 |
| 1994 |
43.8 |
39 |