| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 86.5 | 124 |
| 2015 | 85.4 | 143 |
| 2014 | 109.4 | 136 |
| 2013 | 109.6 | 139 |
| 2012 | 102.3 | 139 |
| 2011 | 98.8 | 138 |
| 2010 | 81 | 138 |
| 2009 | 74.3 | 138 |
| 2008 | 92.5 | 132 |
| 2007 | 65.9 | 137 |
| 2006 | 50 | 140 |
| 2005 | 42 | 142 |
| 2004 | 34.1 | 142 |
| 2003 | 26.5 | 145 |
| 2002 | 20.8 | 144 |
| 2001 | 18.3 | 144 |
| 2000 | 16.2 | 146 |
| 1999 | 13.5 | 149 |
| 1998 | 20.7 | 138 |
| 1997 | 23.1 | 137 |
| 1996 | 20.1 | 143 |
| 1995 | 19 | 141 |