| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.86 | 165 |
| 2015 | 18.99 | 166 |
| 2014 | 17.18 | 172 |
| 2013 | 16.9 | 172 |
| 2012 | 18.47 | 168 |
| 2011 | 22.17 | 157 |
| 2010 | 25.3 | 144 |
| 2009 | 28.56 | 134 |
| 2008 | 36.97 | 102 |
| 2007 | 40.23 | 84 |
| 2006 | 40.57 | 83 |
| 2005 | 39.26 | 86 |
| 2004 | 35.76 | 108 |
| 2003 | 34.73 | 116 |
| 2002 | 34.75 | 115 |
| 2001 | 35.19 | 117 |
| 2000 | 34.46 | 122 |
| 1999 | 32.38 | 135 |
| 1998 | 28.81 | 151 |
| 1997 | 27.13 | 151 |
| 1996 | 26.14 | 158 |
| 1995 | 26.57 | 158 |
| 1994 | 25.98 | 163 |
| 1993 | 27.48 | 156 |
| 1992 | 32.74 | 143 |
| 1991 | 35.03 | 136 |