| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 53.11 | 71 |
| 2015 | 50.98 | 85 |
| 2014 | 44.56 | 92 |
| 2013 | 44.44 | 94 |
| 2012 | 45.9 | 83 |
| 2011 | 46.4 | 83 |
| 2010 | 49.27 | 81 |
| 2009 | 38.93 | 100 |
| 2008 | 36.64 | 98 |
| 2007 | 36.96 | 105 |
| 2006 | 37.02 | 100 |
| 2005 | 42.4 | 87 |
| 2004 | 43.07 | 80 |
| 2003 | 47.89 | 66 |
| 2002 | 43.92 | 74 |
| 2001 | 39.15 | 83 |
| 2000 | 37.47 | 78 |
| 1999 | 34.9 | 83 |
| 1998 | 31.02 | 88 |
| 1997 | 33.12 | 84 |
| 1996 | 31.92 | 86 |
| 1995 | 36.15 | 71 |
| 1994 | 36.24 | 71 |
| 1993 | 38.04 | 66 |
| 1992 | 32.96 | 74 |
| 1991 | 28.93 | 84 |