| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 25.14 | 145 |
| 2015 | 24.64 | 144 |
| 2014 | 24.03 | 146 |
| 2013 | 23.9 | 148 |
| 2012 | 23.56 | 149 |
| 2011 | 24.01 | 146 |
| 2010 | 24.04 | 151 |
| 2009 | 27.54 | 140 |
| 2008 | 30.02 | 136 |
| 2007 | 26.58 | 147 |
| 2006 | 32.21 | 132 |
| 2005 | 30.17 | 135 |
| 2004 | 33.86 | 120 |
| 2003 | 33.24 | 121 |
| 2002 | 31.73 | 136 |
| 2001 | 33.65 | 124 |
| 2000 | 33.94 | 125 |
| 1999 | 33.16 | 129 |
| 1998 | 34.06 | 132 |
| 1997 | 34.79 | 128 |
| 1996 | 38.04 | 103 |
| 1995 | 37.92 | 111 |
| 1994 | 38.77 | 111 |
| 1993 | 43.46 | 85 |
| 1992 | 43.05 | 90 |
| 1991 | 44.85 | 82 |