| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 58.84 | 1 |
| 2012 | 53.29 | 2 |
| 2011 | 49.2 | 3 |
| 2010 | 23.55 | 28 |
| 2009 | 23.33 | 27 |
| 2008 | 28.8 | 25 |
| 2007 | 33.89 | 35 |
| 2006 | 72.74 | 5 |
| 2005 | 47.44 | 5 |
| 2004 | 49.95 | 6 |
| 2003 | 62.41 | 4 |
| 2002 | 14.64 | 66 |
| 2001 | 10.73 | 99 |
| 2000 | 33.73 | 32 |
| 1999 | 21.67 | 40 |
| 1998 | 7.38 | 103 |
| 1997 | 55.55 | 12 |
| 1996 | 68.81 | 7 |
| 1995 | 36.56 | 28 |
| 1994 | 68.89 | 17 |
| 1993 | 25.55 | 46 |
| 1992 | 17.74 | 62 |
| 1991 | 47.55 | 18 |
| 1990 | 64.88 | 11 |
| 1989 | 41.93 | 20 |
| 1988 | 20.38 | 55 |
| 1987 | 18.58 | 53 |
| 1986 | 12.92 | 67 |