| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 63.89 | 65 |
| 2015 | 69.66 | 64 |
| 2014 | 77.81 | 60 |
| 2013 | 82.35 | 55 |
| 2012 | 87.3 | 50 |
| 2011 | 89.78 | 49 |
| 2010 | 81.46 | 54 |
| 2009 | 76.13 | 51 |
| 2008 | 85.54 | 56 |
| 2007 | 64.87 | 89 |
| 2006 | 62.74 | 100 |
| 2005 | 60.75 | 95 |
| 2004 | 62.53 | 87 |
| 2003 | 54.76 | 98 |
| 2002 | 51.66 | 104 |
| 2001 | 54.69 | 94 |
| 2000 | 59.25 | 86 |
| 1999 | 54.29 | 91 |
| 1998 | 60.28 | 73 |
| 1997 | 50.36 | 105 |
| 1996 | 46.82 | 114 |
| 1995 | 46.78 | 110 |
| 1994 | 43.54 | 107 |
| 1993 | 42.98 | 98 |
| 1992 | 45.25 | 88 |
| 1991 | 47.09 | 81 |
| 1990 | 48.28 | 81 |
| 1989 | 50.85 | 72 |
| 1988 | 57.12 | 55 |
| 1987 | 60.42 | 46 |
| 1986 | 57.38 | 51 |