| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 1 | 74 |
| 2015 | 1 | 148 |
| 2014 | 1 | 158 |
| 2013 | 0 | 173 |
| 2012 | 0 | 178 |
| 2011 | 0 | 179 |
| 2010 | 0 | 176 |
| 2009 | 0 | 177 |
| 2008 | 0 | 175 |
| 2007 | 0 | 177 |
| 2006 | 0 | 172 |
| 2005 | 0 | 169 |
| 2004 | 0 | 158 |
| 2003 | 0 | 156 |
| 2002 | 0 | 154 |
| 2001 | 0 | 148 |
| 2000 | 0 | 148 |
| 1999 | 0 | 148 |
| 1998 | 0 | 146 |
| 1997 | 0 | 144 |
| 1990 | 0 | 131 |
| 1989 | 0 | 130 |
| 1988 | 0 | 128 |
| 1987 | 0 | 129 |
| 1986 | 0 | 127 |