| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.78 | 66 |
| 2015 | 53.27 | 64 |
| 2014 | 52.79 | 64 |
| 2013 | 52.95 | 62 |
| 2012 | 49.81 | 76 |
| 2011 | 51.39 | 70 |
| 2010 | 50.19 | 70 |
| 2009 | 48.29 | 86 |
| 2008 | 48.15 | 87 |
| 2007 | 47.61 | 89 |
| 2006 | 44.22 | 103 |
| 2005 | 41.32 | 120 |
| 2004 | 40.14 | 124 |
| 2003 | 35.45 | 140 |
| 2002 | 32.73 | 151 |
| 2001 | 30.16 | 159 |
| 2000 | 36.73 | 132 |
| 1999 | 38.26 | 125 |
| 1998 | 37.97 | 126 |
| 1997 | 34.01 | 142 |
| 1996 | 40.37 | 111 |
| 1995 | 41.2 | 106 |
| 1994 | 41.24 | 107 |
| 1993 | 41.17 | 104 |
| 1992 | 40.77 | 106 |
| 1991 | 40.09 | 105 |