| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 55.69 | 84 |
| 2015 | 54.27 | 99 |
| 2014 | 52.32 | 117 |
| 2013 | 52.83 | 120 |
| 2012 | 50.5 | 127 |
| 2011 | 50.37 | 132 |
| 2010 | 56.25 | 103 |
| 2009 | 41.01 | 144 |
| 2008 | 42.68 | 164 |
| 2007 | 37.44 | 170 |
| 2006 | 44.74 | 148 |
| 2005 | 44.63 | 145 |
| 2004 | 47.98 | 128 |
| 2003 | 51.83 | 105 |
| 2002 | 40.61 | 142 |
| 2001 | 35.79 | 153 |
| 2000 | 34.25 | 157 |
| 1999 | 32.72 | 152 |
| 1998 | 30 | 158 |
| 1997 | 25.76 | 167 |
| 1996 | 25.97 | 168 |
| 1995 | 27.12 | 164 |
| 1994 | 15.36 | 172 |
| 1993 | 23.16 | 146 |
| 1992 | 15.55 | 153 |
| 1991 | 16.29 | 147 |