| 时间 |
值 （亿美元） |
世界排名 |
| 2014 |
227.6 |
14 |
| 2013 |
235.6 |
14 |
| 2012 |
190.2 |
15 |
| 2011 |
191.8 |
16 |
| 2010 |
175 |
17 |
| 2009 |
138.4 |
18 |
| 2008 |
115.7 |
19 |
| 2007 |
84.6 |
22 |
| 2006 |
71.7 |
21 |
| 2005 |
66 |
21 |
| 2004 |
68.2 |
19 |
| 2003 |
58.3 |
19 |
| 2002 |
53.5 |
19 |
| 2001 |
58 |
19 |
| 2000 |
58.8 |
19 |
| 1999 |
42.3 |
22 |
| 1998 |
40.1 |
22 |
| 1997 |
33.4 |
26 |