| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
6.9 |
110 |
| 2015 |
6.7 |
137 |
| 2014 |
6.9 |
139 |
| 2013 |
6.8 |
141 |
| 2012 |
6.7 |
142 |
| 2011 |
6.5 |
142 |
| 2010 |
6.4 |
154 |
| 2009 |
5.1 |
143 |
| 2008 |
4.9 |
141 |
| 2007 |
3.8 |
141 |
| 2006 |
2.5 |
141 |
| 2005 |
2.3 |
135 |
| 2004 |
2 |
136 |
| 2003 |
1.6 |
137 |
| 2002 |
1.2 |
137 |
| 2001 |
1.3 |
136 |
| 2000 |
1.1 |
133 |
| 1999 |
2 |
124 |
| 1998 |
1.9 |
123 |
| 1997 |
1.8 |
124 |