| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 3.35 | 82 |
| 2014 | 0.63 | 164 |
| 2013 | 2.46 | 105 |
| 2012 | 4.65 | 69 |
| 2011 | 4.42 | 74 |
| 2010 | 4.74 | 65 |
| 2009 | 4.07 | 74 |
| 2008 | 5.94 | 73 |
| 2007 | 7.14 | 73 |
| 2006 | 5.2 | 79 |
| 2005 | 9.06 | 28 |
| 2004 | 2.64 | 97 |
| 2003 | 2.84 | 81 |
| 2002 | 1.63 | 115 |
| 2001 | 2.08 | 95 |
| 2000 | 1.9 | 112 |
| 1999 | 1.57 | 107 |
| 1998 | 1.77 | 110 |
| 1997 | 1.24 | 115 |
| 1996 | 1.17 | 99 |
| 1995 | 0.55 | 119 |
| 1994 | 0.3 | 121 |
| 1993 | 0.3 | 118 |
| 1992 | 0.27 | 103 |