| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 35.3 | 148 |
| 2015 | 35.14 | 148 |
| 2014 | 34.98 | 148 |
| 2013 | 34.94 | 149 |
| 2012 | 34.77 | 148 |
| 2011 | 34.67 | 148 |
| 2010 | 34.42 | 149 |
| 2009 | 34.05 | 152 |
| 2008 | 33.65 | 151 |
| 2007 | 33.67 | 154 |
| 2006 | 33.15 | 156 |
| 2005 | 33.48 | 153 |
| 2004 | 33.35 | 153 |
| 2003 | 33.26 | 152 |
| 2002 | 33.22 | 149 |
| 2001 | 33.17 | 149 |
| 2000 | 33.07 | 150 |
| 1999 | 33.02 | 146 |
| 1998 | 32.89 | 147 |
| 1997 | 32.75 | 147 |
| 1996 | 32.52 | 143 |
| 1995 | 32.22 | 145 |
| 1994 | 32.08 | 145 |
| 1993 | 31.83 | 143 |
| 1992 | 30.91 | 146 |
| 1991 | 31.27 | 143 |