| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 30.16 | 5 |
| 2015 | 29.79 | 4 |
| 2014 | 30.37 | 5 |
| 2013 | 31.15 | 5 |
| 2012 | 32.08 | 5 |
| 2011 | 32.97 | 5 |
| 2010 | 33.7 | 6 |
| 2009 | 34.58 | 6 |
| 2008 | 35.41 | 6 |
| 2007 | 36.32 | 6 |
| 2006 | 37.55 | 7 |
| 2005 | 39.15 | 9 |
| 2004 | 39.54 | 8 |
| 2003 | 40.31 | 7 |
| 2002 | 41.28 | 7 |
| 2001 | 42.16 | 7 |
| 2000 | 42.8 | 7 |
| 1999 | 43.5 | 7 |
| 1998 | 44.09 | 7 |
| 1997 | 44.84 | 9 |
| 1996 | 45.94 | 10 |
| 1995 | 47.22 | 19 |
| 1991 | 54.05 | 57 |
| 1990 | 56.78 | 64 |
| 1989 | 58.83 | 64 |
| 1988 | 60.65 | 70 |
| 1987 | 62.3 | 70 |
| 1986 | 63.48 | 69 |