| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.5 | 120 |
| 2015 | 0.43 | 139 |
| 2014 | 0.61 | 143 |
| 2013 | 0.128 | 156 |
| 2012 | 0.368 | 155 |
| 2011 | 0.508 | 151 |
| 2010 | 1.865 | 121 |
| 2009 | 8.043 | 42 |
| 2008 | 6.339 | 70 |
| 2007 | 6.063 | 68 |
| 2006 | 3.533 | 110 |
| 2005 | 2.781 | 118 |
| 2004 | 3.268 | 100 |
| 2003 | 3.022 | 109 |
| 2002 | 3.234 | 109 |
| 2001 | 5.24 | 83 |
| 2000 | 4.383 | 110 |
| 1999 | 5.037 | 98 |
| 1998 | 5.327 | 103 |
| 1997 | 5.897 | 95 |
| 1996 | 11.711 | 57 |
| 1995 | 14.794 | 40 |
| 1994 | 31.683 | 18 |
| 1993 | 34.784 | 13 |