| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.36 | 74 |
| 2015 | 4.77 | 144 |
| 2014 | 4.21 | 157 |
| 2013 | 4.07 | 173 |
| 2012 | 3.9 | 176 |
| 2011 | 3.92 | 177 |
| 2010 | 3.9 | 176 |
| 2009 | 4.45 | 175 |
| 2008 | 3.93 | 173 |
| 2007 | 4.04 | 175 |
| 2006 | 4.1 | 173 |
| 2005 | 4.45 | 169 |
| 2004 | 4.45 | 157 |
| 2003 | 4.31 | 155 |
| 2002 | 4.09 | 154 |
| 2001 | 4.05 | 149 |
| 2000 | 4.47 | 143 |
| 1999 | 4.46 | 139 |
| 1998 | 4.84 | 138 |
| 1997 | 6.47 | 131 |
| 1996 | 6.68 | 131 |
| 1995 | 7.1 | 127 |
| 1994 | 5.53 | 124 |
| 1993 | 5.35 | 125 |
| 1992 | 7.14 | 115 |
| 1991 | 7.59 | 111 |
| 1990 | 8.36 | 96 |
| 1989 | 8.11 | 95 |
| 1988 | 8.03 | 91 |
| 1987 | 8.8 | 88 |
| 1986 | 8.56 | 88 |