| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
6.9 |
67 |
| 2015 |
7.5 |
73 |
| 2014 |
9.1 |
75 |
| 2013 |
9.6 |
74 |
| 2012 |
9.6 |
72 |
| 2011 |
11.1 |
68 |
| 2010 |
10.2 |
70 |
| 2009 |
11.3 |
71 |
| 2008 |
13 |
68 |
| 2007 |
9.8 |
70 |
| 2006 |
8.5 |
66 |
| 2005 |
8 |
67 |
| 2004 |
7.3 |
66 |
| 2003 |
7.1 |
65 |
| 2002 |
7.3 |
60 |
| 2001 |
6.3 |
60 |
| 2000 |
6.6 |
60 |
| 1999 |
10.4 |
51 |
| 1998 |
14.3 |
46 |
| 1997 |
18 |
45 |
| 1996 |
19.4 |
41 |
| 1995 |
20.6 |
38 |