| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.41 | 177 |
| 2015 | 0.36 | 178 |
| 2014 | 0.39 | 172 |
| 2013 | 0.39 | 171 |
| 2012 | 0.37 | 172 |
| 2011 | 0.39 | 170 |
| 2010 | 0.47 | 170 |
| 2009 | 0.5 | 170 |
| 2008 | 0.46 | 174 |
| 2007 | 0.43 | 174 |
| 2006 | 0.41 | 174 |
| 2005 | 0.44 | 171 |
| 2004 | 0.91 | 152 |
| 2003 | 2.04 | 102 |
| 2002 | 2.08 | 104 |
| 2001 | 2.12 | 102 |
| 2000 | 1.59 | 123 |
| 1999 | 1.53 | 120 |
| 1998 | 1.55 | 122 |
| 1997 | 1.65 | 121 |
| 1996 | 1.83 | 112 |
| 1995 | 2.04 | 108 |
| 1994 | 2.23 | 104 |
| 1993 | 2.34 | 104 |
| 1992 | 2.35 | 109 |
| 1991 | 2.44 | 111 |
| 1990 | 2.39 | 112 |
| 1989 | 2.34 | 116 |
| 1988 | 2.41 | 118 |
| 1987 | 2.66 | 113 |
| 1986 | 3.02 | 101 |