| 时间 | 值 （亿元） | 世界排名 |
|---|---|---|
| 2016 | 2.2 | 136 |
| 2015 | 1.8 | 151 |
| 2014 | 1.9 | 153 |
| 2013 | 1.5 | 155 |
| 2012 | 1.3 | 156 |
| 2011 | 1.2 | 157 |
| 2010 | 1.1 | 159 |
| 2009 | 1.1 | 160 |
| 2008 | 1 | 165 |
| 2007 | 0.9 | 165 |
| 2006 | 0.9 | 165 |
| 2005 | 1 | 164 |
| 2004 | 1 | 162 |
| 2003 | 1 | 161 |
| 2002 | 1 | 161 |
| 2001 | 1.2 | 160 |
| 2000 | 1.1 | 160 |
| 1999 | 1.1 | 155 |
| 1998 | 1.1 | 155 |
| 1997 | 1.1 | 154 |
| 1996 | 1 | 153 |
| 1995 | 1.1 | 150 |