| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.34 | 180 |
| 2015 | 0.41 | 176 |
| 2014 | 0.44 | 169 |
| 2013 | 0.49 | 167 |
| 2012 | 0.55 | 163 |
| 2011 | 0.61 | 157 |
| 2010 | 0.88 | 148 |
| 2009 | 0.92 | 146 |
| 2008 | 1.06 | 141 |
| 2007 | 1.21 | 133 |
| 2006 | 1.31 | 132 |
| 2005 | 1.58 | 123 |
| 2004 | 1.75 | 112 |
| 2003 | 2.09 | 98 |
| 2002 | 2.28 | 92 |
| 2001 | 1.93 | 109 |
| 2000 | 0.33 | 180 |
| 1999 | 0.34 | 176 |
| 1998 | 0.43 | 171 |
| 1997 | 0.4 | 175 |
| 1996 | 0.42 | 175 |
| 1995 | 0.55 | 170 |
| 1994 | 0.51 | 172 |
| 1993 | 0.42 | 178 |
| 1992 | 0.42 | 176 |
| 1991 | 0.48 | 175 |
| 1990 | 0.5 | 175 |
| 1989 | 0.57 | 181 |
| 1988 | 0.59 | 183 |
| 1987 | 0.66 | 183 |
| 1986 | 0.77 | 176 |