| 时间 |
值 （亿美元） |
世界排名 |
| 2015 |
37 |
77 |
| 2014 |
39 |
75 |
| 2013 |
40 |
77 |
| 2012 |
40 |
75 |
| 2011 |
44 |
68 |
| 2010 |
41 |
67 |
| 2009 |
44 |
66 |
| 2008 |
52 |
66 |
| 2007 |
42 |
65 |
| 2006 |
38 |
62 |
| 2005 |
35 |
59 |
| 2004 |
37 |
54 |
| 2003 |
31 |
51 |
| 2002 |
24 |
52 |
| 2001 |
20 |
53 |
| 2000 |
19 |
51 |
| 1999 |
20 |
49 |
| 1998 |
19 |
52 |
| 1997 |
20 |
50 |
| 1996 |
17 |
52 |
| 1995 |
14 |
51 |
| 1994 |
12 |
50 |
| 1993 |
11 |
50 |