| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 50.95 | 73 |
| 2015 | 49.53 | 65 |
| 2014 | 47.95 | 57 |
| 2013 | 46.36 | 48 |
| 2012 | 44.84 | 35 |
| 2011 | 43.45 | 31 |
| 2010 | 42.21 | 26 |
| 2009 | 41.43 | 19 |
| 2008 | 40.92 | 17 |
| 2007 | 40.66 | 15 |
| 2006 | 40.52 | 14 |
| 2005 | 40.4 | 12 |
| 2004 | 40.75 | 11 |
| 2003 | 41.23 | 9 |
| 2002 | 41.79 | 8 |
| 2001 | 42.48 | 8 |
| 2000 | 43.32 | 8 |
| 1999 | 44.04 | 8 |
| 1998 | 44.69 | 9 |
| 1997 | 45.32 | 10 |
| 1996 | 46 | 12 |
| 1995 | 46.77 | 16 |
| 1994 | 47.87 | 22 |
| 1993 | 49.17 | 25 |
| 1992 | 50.53 | 35 |
| 1991 | 51.58 | 42 |
| 1990 | 52.06 | 47 |
| 1989 | 52.94 | 49 |
| 1988 | 53.32 | 48 |
| 1987 | 53.38 | 47 |
| 1986 | 53.61 | 46 |