| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.24 | 97 |
| 2015 | 52.35 | 97 |
| 2014 | 52.53 | 96 |
| 2013 | 52.44 | 95 |
| 2012 | 52.5 | 95 |
| 2011 | 52.02 | 99 |
| 2010 | 51.4 | 101 |
| 2009 | 50.65 | 102 |
| 2008 | 49.58 | 105 |
| 2007 | 48.19 | 112 |
| 2006 | 47.33 | 117 |
| 2005 | 45.86 | 125 |
| 2004 | 44.65 | 128 |
| 2003 | 43.12 | 132 |
| 2002 | 41.5 | 137 |
| 2001 | 39.88 | 142 |
| 2000 | 40.87 | 136 |
| 1999 | 39.54 | 140 |
| 1998 | 38.83 | 145 |
| 1997 | 38.46 | 141 |
| 1996 | 37.79 | 141 |
| 1995 | 37.18 | 139 |
| 1994 | 36.67 | 140 |
| 1993 | 35.72 | 144 |
| 1992 | 35.08 | 147 |
| 1991 | 34.4 | 149 |
| 1990 | 34.05 | 152 |