| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 35.91 | 152 |
| 2015 | 34.35 | 159 |
| 2014 | 30.94 | 162 |
| 2013 | 27.95 | 167 |
| 2012 | 25.18 | 167 |
| 2011 | 24.5 | 173 |
| 2010 | 23.23 | 169 |
| 2009 | 21.49 | 170 |
| 2008 | 21.1 | 170 |
| 2007 | 17.46 | 172 |
| 2006 | 14.75 | 173 |
| 2005 | 11.2 | 173 |
| 2004 | 12.02 | 173 |
| 2003 | 10.43 | 172 |
| 2002 | 8.97 | 171 |
| 2001 | 8.7 | 169 |
| 2000 | 6.24 | 178 |
| 1999 | 5.89 | 178 |
| 1998 | 5.4 | 175 |
| 1997 | 5.08 | 174 |
| 1996 | 4.5 | 177 |
| 1995 | 3.99 | 176 |
| 1994 | 3.56 | 168 |
| 1993 | 3.22 | 166 |
| 1992 | 2.85 | 165 |
| 1991 | 2.44 | 169 |
| 1990 | 2.15 | 169 |
| 1989 | 1.9 | 155 |
| 1988 | 1.69 | 153 |
| 1987 | 1.41 | 152 |
| 1986 | 1.42 | 147 |