| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 267.1 | 89 |
| 2015 | 270.7 | 101 |
| 2014 | 301.7 | 96 |
| 2013 | 275.9 | 100 |
| 2012 | 243 | 105 |
| 2011 | 245.4 | 99 |
| 2010 | 193.1 | 103 |
| 2009 | 148.5 | 110 |
| 2008 | 176.8 | 106 |
| 2007 | 124.4 | 113 |
| 2006 | 96.1 | 115 |
| 2005 | 76.7 | 119 |
| 2004 | 69.7 | 115 |
| 2003 | 55.9 | 120 |
| 2002 | 52.2 | 116 |
| 2001 | 69.3 | 101 |
| 2000 | 74.9 | 97 |
| 1999 | 76.8 | 96 |
| 1998 | 83.1 | 93 |
| 1997 | 98.7 | 85 |
| 1996 | 95.5 | 84 |
| 1995 | 85.6 | 86 |
| 1994 | 79.8 | 80 |
| 1993 | 68 | 84 |
| 1992 | 64.3 | 89 |
| 1991 | 61.1 | 89 |