| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
2.6 |
60 |
| 2015 |
2.9 |
131 |
| 2014 |
5.2 |
110 |
| 2013 |
3.1 |
127 |
| 2012 |
3.9 |
129 |
| 2011 |
4.7 |
124 |
| 2010 |
4.4 |
114 |
| 2009 |
1.4 |
133 |
| 2008 |
10 |
101 |
| 2007 |
18.4 |
80 |
| 2006 |
8.5 |
84 |
| 2005 |
6.2 |
90 |
| 2004 |
8.9 |
68 |
| 2003 |
3.8 |
85 |
| 2002 |
2.7 |
85 |
| 2001 |
1.2 |
102 |
| 2000 |
1.5 |
93 |
| 1999 |
1.8 |
90 |
| 1998 |
0.7 |
123 |