| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 48.6 | 84 |
| 2015 | 48.36 | 84 |
| 2014 | 49.03 | 81 |
| 2013 | 47.87 | 85 |
| 2012 | 47.97 | 84 |
| 2011 | 46.32 | 95 |
| 2010 | 46.35 | 94 |
| 2009 | 45.78 | 100 |
| 2008 | 44.12 | 107 |
| 2007 | 44.61 | 104 |
| 2006 | 43.81 | 107 |
| 2005 | 42.73 | 112 |
| 2004 | 41.2 | 115 |
| 2003 | 40.53 | 119 |
| 2002 | 40.85 | 115 |
| 2001 | 40.26 | 116 |
| 2000 | 40.08 | 116 |
| 1999 | 38.38 | 124 |
| 1998 | 36.14 | 131 |
| 1997 | 36.03 | 129 |
| 1996 | 34.67 | 135 |
| 1995 | 33.73 | 137 |
| 1994 | 36.09 | 125 |
| 1993 | 35.8 | 126 |
| 1992 | 37.06 | 122 |
| 1991 | 35.15 | 127 |