| 时间 | 值 （亿元） | 世界排名 |
|---|---|---|
| 2016 | 9.5 | 133 |
| 2015 | 8.7 | 147 |
| 2014 | 8.2 | 149 |
| 2013 | 7.5 | 151 |
| 2012 | 7 | 152 |
| 2011 | 7.1 | 153 |
| 2010 | 7.6 | 155 |
| 2009 | 7.1 | 156 |
| 2008 | 6.6 | 161 |
| 2007 | 6.1 | 161 |
| 2006 | 5.5 | 161 |
| 2005 | 4.8 | 160 |
| 2004 | 4.2 | 159 |
| 2003 | 3.9 | 158 |
| 2002 | 3.4 | 157 |
| 2001 | 3.1 | 156 |
| 2000 | 2.9 | 156 |
| 1999 | 2.5 | 153 |
| 1998 | 2.2 | 153 |
| 1997 | 2.1 | 152 |
| 1996 | 1.8 | 150 |
| 1995 | 1.7 | 148 |
| 1994 | 1.4 | 143 |
| 1993 | 1.2 | 142 |
| 1992 | 1.2 | 131 |
| 1991 | 1.2 | 126 |
| 1990 | 1.2 | 120 |
| 1989 | 1 | 117 |
| 1988 | 0.9 | 115 |
| 1987 | 0.8 | 115 |
| 1986 | 0.6 | 114 |