| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.47 | 74 |
| 2014 | 0.8 | 126 |
| 2013 | 1.45 | 132 |
| 2012 | 1.36 | 160 |
| 2011 | 0.86 | 172 |
| 2010 | 2.81 | 107 |
| 2009 | 4.25 | 69 |
| 2008 | 4.83 | 138 |
| 2007 | 3.96 | 111 |
| 2006 | 2.04 | 151 |
| 2005 | 1.2 | 161 |
| 2004 | 1.42 | 136 |
| 2003 | 3.02 | 92 |
| 2002 | 1.96 | 118 |
| 2001 | 3.65 | 93 |
| 2000 | 2.46 | 107 |
| 1999 | 2 | 107 |
| 1998 | 3.28 | 99 |
| 1997 | 2.83 | 114 |
| 1996 | 0.91 | 153 |
| 1995 | 2.23 | 136 |
| 1994 | 2.3 | 130 |
| 1993 | 3.57 | 105 |
| 1992 | 4.06 | 96 |
| 1991 | 6.47 | 86 |
| 1990 | 4.76 | 95 |
| 1989 | 7.75 | 65 |
| 1988 | 8.76 | 57 |
| 1987 | 16.04 | 34 |
| 1986 | 4.77 | 72 |