| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 39.5 | 139 |
| 2015 | 39.2 | 138 |
| 2014 | 38.73 | 137 |
| 2013 | 38.65 | 136 |
| 2012 | 38.51 | 137 |
| 2011 | 38.41 | 139 |
| 2010 | 37.22 | 143 |
| 2009 | 34.92 | 148 |
| 2008 | 33.48 | 152 |
| 2007 | 32.03 | 157 |
| 2006 | 29.75 | 160 |
| 2005 | 31.43 | 157 |
| 2004 | 32.49 | 155 |
| 2003 | 33.7 | 148 |
| 2002 | 35.99 | 138 |
| 2001 | 35.3 | 138 |
| 2000 | 35.99 | 135 |
| 1999 | 37.92 | 128 |
| 1998 | 38.92 | 121 |
| 1997 | 39.24 | 116 |
| 1996 | 40.14 | 112 |
| 1995 | 42.2 | 104 |
| 1994 | 43.62 | 95 |
| 1993 | 45.06 | 88 |
| 1992 | 46.43 | 80 |
| 1991 | 45.97 | 84 |