| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 29.81 | 65 |
| 2015 | 29.77 | 65 |
| 2014 | 29.67 | 64 |
| 2013 | 29.52 | 62 |
| 2012 | 29.36 | 58 |
| 2011 | 29.24 | 56 |
| 2010 | 29.19 | 54 |
| 2009 | 29.23 | 54 |
| 2008 | 29.39 | 54 |
| 2007 | 29.71 | 53 |
| 2006 | 30.19 | 53 |
| 2005 | 30.8 | 55 |
| 2004 | 31.74 | 56 |
| 2003 | 32.88 | 56 |
| 2002 | 34.22 | 57 |
| 2001 | 35.82 | 59 |
| 2000 | 37.67 | 59 |
| 1999 | 39.67 | 63 |
| 1998 | 41.95 | 64 |
| 1997 | 44.36 | 68 |
| 1996 | 46.66 | 71 |
| 1995 | 48.69 | 74 |
| 1994 | 50.49 | 75 |
| 1993 | 51.84 | 75 |
| 1992 | 52.88 | 75 |
| 1991 | 53.97 | 77 |
| 1990 | 55.37 | 80 |
| 1989 | 56.03 | 77 |
| 1988 | 56.76 | 77 |
| 1987 | 57.38 | 77 |
| 1986 | 57.53 | 75 |