| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 159.03 | 110 |
| 2015 | 143.9 | 116 |
| 2014 | 132.68 | 127 |
| 2013 | 119.42 | 134 |
| 2012 | 101.91 | 137 |
| 2011 | 82.61 | 141 |
| 2010 | 71.28 | 142 |
| 2009 | 58.33 | 144 |
| 2008 | 54.44 | 147 |
| 2007 | 42.23 | 155 |
| 2006 | 34.53 | 153 |
| 2005 | 27.36 | 157 |
| 2004 | 23.66 | 157 |
| 2003 | 20.23 | 155 |
| 2002 | 17.58 | 154 |
| 2001 | 17.69 | 147 |
| 2000 | 17.31 | 151 |
| 1999 | 14.54 | 154 |
| 1998 | 12.8 | 158 |
| 1997 | 17.47 | 149 |
| 1996 | 18.74 | 146 |
| 1995 | 17.64 | 145 |
| 1994 | 15.44 | 139 |
| 1993 | 13.28 | 143 |
| 1992 | 11.28 | 147 |
| 1991 | 10.28 | 149 |
| 1990 | 8.66 | 150 |
| 1989 | 7.14 | 137 |
| 1988 | 5.99 | 138 |
| 1987 | 10.87 | 128 |
| 1986 | 17.77 | 108 |