| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
3.1 |
93 |
| 2015 |
3.3 |
96 |
| 2014 |
4.2 |
92 |
| 2013 |
4.4 |
85 |
| 2012 |
4.9 |
81 |
| 2011 |
4.7 |
82 |
| 2010 |
4.5 |
83 |
| 2009 |
6 |
79 |
| 2008 |
10.9 |
73 |
| 2007 |
9.3 |
75 |
| 2006 |
4 |
80 |
| 2005 |
2.1 |
94 |
| 2004 |
0.7 |
117 |
| 2003 |
0.4 |
125 |
| 2002 |
0.3 |
123 |
| 2001 |
0.2 |
127 |
| 2000 |
0.2 |
130 |
| 1999 |
0.3 |
124 |
| 1998 |
0.4 |
113 |
| 1997 |
0.4 |
114 |
| 1996 |
0.7 |
101 |