| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 65.87 | 52 |
| 2015 | 64.51 | 58 |
| 2014 | 63.34 | 55 |
| 2013 | 61.4 | 55 |
| 2012 | 60.74 | 51 |
| 2011 | 59.81 | 58 |
| 2010 | 58.75 | 62 |
| 2009 | 54.88 | 68 |
| 2008 | 51.19 | 72 |
| 2007 | 50.28 | 76 |
| 2006 | 50.48 | 68 |
| 2005 | 47.42 | 73 |
| 2004 | 45.62 | 75 |
| 2003 | 43.99 | 78 |
| 2002 | 42.74 | 77 |
| 2001 | 40.27 | 78 |
| 2000 | 30.55 | 93 |
| 1999 | 27.89 | 100 |
| 1998 | 26.23 | 98 |
| 1997 | 25.94 | 97 |
| 1996 | 25.63 | 97 |
| 1995 | 28.83 | 89 |
| 1994 | 28.95 | 89 |
| 1993 | 26.2 | 100 |
| 1992 | 24.87 | 98 |
| 1991 | 24.01 | 95 |
| 1990 | 22.45 | 93 |
| 1989 | 22.88 | 91 |
| 1988 | 21.48 | 96 |
| 1987 | 20.81 | 97 |
| 1986 | 20.2 | 97 |