| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 39.15 | 32 |
| 2012 | 38.95 | 29 |
| 2011 | 44.04 | 24 |
| 2010 | 41.39 | 27 |
| 2009 | 36.27 | 35 |
| 2008 | 39.89 | 29 |
| 2007 | 41.01 | 34 |
| 2006 | 38.98 | 34 |
| 2005 | 36.89 | 32 |
| 2004 | 35.73 | 32 |
| 2003 | 34.89 | 29 |
| 2002 | 39.51 | 25 |
| 2001 | 36.99 | 26 |
| 2000 | 42.42 | 19 |
| 1999 | 59.7 | 7 |
| 1998 | 55.81 | 7 |
| 1997 | 55.96 | 6 |
| 1996 | 49.11 | 13 |
| 1995 | 46.66 | 18 |
| 1994 | 41.58 | 22 |
| 1993 | 41.88 | 21 |
| 1992 | 38.89 | 20 |
| 1991 | 37.65 | 21 |
| 1990 | 38.11 | 18 |
| 1989 | 33.11 | 23 |
| 1988 | 29.59 | 25 |
| 1987 | 28.21 | 25 |
| 1986 | 28.4 | 27 |