| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.39 | 38 |
| 2015 | 74.23 | 47 |
| 2014 | 71.68 | 45 |
| 2013 | 69.8 | 45 |
| 2012 | 58.97 | 54 |
| 2011 | 59.96 | 57 |
| 2010 | 61.4 | 60 |
| 2009 | 62.11 | 59 |
| 2008 | 59.43 | 57 |
| 2007 | 60.5 | 54 |
| 2006 | 60.66 | 50 |
| 2005 | 50.41 | 65 |
| 2004 | 52.52 | 58 |
| 2003 | 53.8 | 58 |
| 2002 | 56.25 | 52 |
| 2001 | 55.01 | 52 |
| 2000 | 57.68 | 40 |
| 1999 | 58.88 | 37 |
| 1998 | 55.34 | 43 |
| 1997 | 62.03 | 34 |
| 1996 | 56.3 | 41 |
| 1995 | 51.85 | 46 |
| 1994 | 47.12 | 50 |
| 1993 | 42.69 | 60 |
| 1992 | 36.34 | 66 |
| 1991 | 34.8 | 70 |
| 1990 | 34.25 | 63 |
| 1989 | 32.57 | 67 |
| 1988 | 28.96 | 76 |
| 1987 | 27.5 | 79 |
| 1986 | 27.61 | 81 |