| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
7.1 |
66 |
| 2015 |
7.2 |
74 |
| 2014 |
9.1 |
73 |
| 2013 |
9.2 |
75 |
| 2012 |
8.5 |
74 |
| 2011 |
9.9 |
72 |
| 2010 |
8.7 |
72 |
| 2009 |
9.7 |
72 |
| 2008 |
11.1 |
71 |
| 2007 |
9.7 |
71 |
| 2006 |
7.1 |
73 |
| 2005 |
6.3 |
72 |
| 2004 |
7.4 |
64 |
| 2003 |
7.3 |
63 |
| 2002 |
6.8 |
62 |
| 2001 |
4.9 |
66 |
| 2000 |
3.4 |
72 |
| 1999 |
7.4 |
61 |
| 1998 |
6.4 |
60 |
| 1997 |
9.1 |
55 |
| 1996 |
7.4 |
57 |