| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 30.07 | 154 |
| 2015 | 30.97 | 161 |
| 2014 | 30.94 | 163 |
| 2013 | 27.15 | 168 |
| 2012 | 24.72 | 168 |
| 2011 | 23.56 | 174 |
| 2010 | 20.27 | 174 |
| 2009 | 17.4 | 175 |
| 2008 | 16.12 | 176 |
| 2007 | 13.56 | 177 |
| 2006 | 12.73 | 177 |
| 2005 | 11.17 | 174 |
| 2004 | 9.15 | 177 |
| 2003 | 7.85 | 178 |
| 2002 | 8.25 | 173 |
| 2001 | 8.77 | 167 |
| 2000 | 8.7 | 168 |
| 1999 | 8.08 | 168 |
| 1998 | 8.94 | 166 |
| 1997 | 9.73 | 161 |
| 1996 | 8.69 | 165 |
| 1995 | 10 | 162 |
| 1994 | 9.25 | 152 |
| 1993 | 9.39 | 150 |
| 1992 | 10.83 | 148 |
| 1991 | 11.67 | 145 |
| 1990 | 11.32 | 144 |
| 1989 | 11.14 | 130 |
| 1988 | 10.82 | 131 |
| 1987 | 11.31 | 127 |
| 1986 | 12.02 | 118 |