| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 5.44 | 141 |
| 2014 | 5.8 | 151 |
| 2013 | 5.95 | 163 |
| 2012 | 6.04 | 163 |
| 2011 | 6.18 | 164 |
| 2010 | 6.6 | 161 |
| 2009 | 6.83 | 160 |
| 2008 | 6.94 | 159 |
| 2007 | 7.25 | 156 |
| 2006 | 6.98 | 157 |
| 2005 | 7.02 | 158 |
| 2004 | 7.09 | 146 |
| 2003 | 7.82 | 139 |
| 2002 | 8.48 | 139 |
| 2001 | 4.85 | 144 |
| 2000 | 4.95 | 138 |
| 1999 | 4.76 | 138 |
| 1998 | 4.72 | 139 |
| 1997 | 4.62 | 138 |
| 1996 | 4.53 | 138 |
| 1995 | 4.28 | 138 |
| 1994 | 4.06 | 132 |
| 1993 | 3.96 | 131 |
| 1992 | 3.71 | 126 |
| 1991 | 3.38 | 126 |
| 1990 | 3.94 | 118 |
| 1989 | 6.51 | 110 |
| 1988 | 3.74 | 113 |
| 1987 | 3.92 | 111 |
| 1986 | 3.69 | 110 |