| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 60.33 | 71 |
| 2015 | 60.73 | 69 |
| 2014 | 60.86 | 69 |
| 2013 | 60.99 | 67 |
| 2012 | 60.31 | 73 |
| 2011 | 60.66 | 68 |
| 2010 | 59.97 | 72 |
| 2009 | 60.15 | 71 |
| 2008 | 61.3 | 68 |
| 2007 | 60.79 | 70 |
| 2006 | 60.55 | 68 |
| 2005 | 59.52 | 71 |
| 2004 | 58.3 | 82 |
| 2003 | 55.89 | 101 |
| 2002 | 54.93 | 107 |
| 2001 | 54.59 | 109 |
| 2000 | 53.78 | 117 |
| 1999 | 53.21 | 117 |
| 1998 | 52.63 | 120 |
| 1997 | 52.06 | 125 |
| 1996 | 51.11 | 132 |
| 1995 | 49.81 | 137 |
| 1994 | 48.43 | 149 |
| 1993 | 46.73 | 153 |
| 1992 | 45.82 | 159 |
| 1991 | 44.95 | 162 |