| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.39 | 8 |
| 2015 | 13.58 | 44 |
| 2014 | 3.94 | 131 |
| 2013 | 15.94 | 44 |
| 2012 | 10.02 | 80 |
| 2011 | 5.48 | 120 |
| 2010 | 7.9 | 111 |
| 2009 | 26.8 | 19 |
| 2008 | 15.38 | 77 |
| 2007 | 21.47 | 63 |
| 2006 | 25.08 | 48 |
| 2005 | 9.72 | 119 |
| 2004 | 7.01 | 127 |
| 2003 | 14.44 | 71 |
| 2002 | 13.24 | 76 |
| 2001 | 9.73 | 103 |
| 2000 | -6.61 | 157 |
| 1999 | 15.63 | 65 |
| 1998 | 12.87 | 69 |
| 1997 | 19.41 | 66 |
| 1996 | 16.33 | 72 |
| 1995 | 3.86 | 134 |
| 1994 | 10.87 | 104 |
| 1993 | 13.56 | 79 |
| 1992 | 21.21 | 50 |
| 1991 | 20.09 | 51 |
| 1990 | 0.6 | 111 |
| 1989 | 25.66 | 35 |
| 1988 | 37.2 | 20 |
| 1987 | 14.07 | 70 |
| 1986 | 11.13 | 76 |