| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0 | 123 |
| 2015 | 13.14 | 48 |
| 2014 | 15.64 | 29 |
| 2013 | 18.11 | 33 |
| 2012 | 19.37 | 29 |
| 2011 | 22.97 | 21 |
| 2010 | 12.63 | 77 |
| 2009 | 10.13 | 83 |
| 2008 | 24.69 | 36 |
| 2007 | 26.94 | 47 |
| 2006 | 23.36 | 54 |
| 2005 | 13.85 | 90 |
| 2004 | -5.11 | 161 |
| 2003 | 14.22 | 74 |
| 2002 | -5.8 | 154 |
| 2001 | 26.02 | 46 |
| 2000 | 1.55 | 140 |
| 1999 | 3.23 | 142 |
| 1998 | 13.42 | 63 |
| 1997 | 18.96 | 68 |
| 1996 | 39.84 | 20 |
| 1995 | 7.66 | 112 |
| 1994 | 24.21 | 64 |
| 1993 | 33.7 | 32 |
| 1992 | 34.47 | 29 |
| 1991 | 50.73 | 14 |
| 1990 | 52.87 | 16 |
| 1989 | 21.43 | 41 |
| 1988 | 27.84 | 32 |
| 1987 | 94.94 | 9 |
| 1986 | 184.37 | 3 |