| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.01 | 139 |
| 2015 | 0.01 | 153 |
| 2014 | 0.01 | 158 |
| 2013 | 0.01 | 159 |
| 2012 | 0.01 | 160 |
| 2011 | 0.01 | 159 |
| 2010 | 0.01 | 163 |
| 2009 | 0.011 | 164 |
| 2008 | 0.448 | 163 |
| 2007 | 2.423 | 150 |
| 2006 | 2.7 | 134 |
| 2005 | 1.261 | 155 |
| 2004 | 0.025 | 159 |
| 2003 | 0.067 | 154 |
| 2002 | 0.345 | 149 |
| 2001 | 2.378 | 136 |
| 2000 | 4.801 | 105 |
| 1999 | 4.499 | 113 |
| 1998 | 6.622 | 92 |
| 1997 | 5.978 | 93 |
| 1996 | 4.643 | 113 |
| 1995 | 5.628 | 99 |
| 1994 | 3.54 | 122 |
| 1993 | 2.25 | 123 |
| 1992 | 3.07 | 115 |
| 1991 | 5.46 | 96 |
| 1990 | 6.67 | 83 |