| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.27 | 182 |
| 2015 | 0.21 | 182 |
| 2014 | -.01 | 188 |
| 2013 | -.04 | 186 |
| 2012 | 0.36 | 175 |
| 2011 | 0.65 | 155 |
| 2010 | 0.76 | 153 |
| 2009 | 1.19 | 135 |
| 2008 | 1.9 | 109 |
| 2007 | 2.16 | 91 |
| 2006 | 2 | 104 |
| 2005 | 2 | 102 |
| 2004 | 2.04 | 96 |
| 2003 | 2.13 | 96 |
| 2002 | 1.66 | 122 |
| 2001 | 0.8 | 155 |
| 2000 | 0.55 | 169 |
| 1999 | 0.51 | 171 |
| 1998 | 0.52 | 168 |
| 1997 | 0.53 | 172 |
| 1996 | 0.52 | 171 |
| 1995 | 0.55 | 172 |
| 1994 | 0.58 | 170 |
| 1993 | 0.63 | 171 |
| 1992 | 0.6 | 168 |
| 1991 | 0.49 | 174 |
| 1990 | 0.4 | 181 |
| 1989 | 0.46 | 184 |
| 1988 | 0.52 | 185 |
| 1987 | 0.57 | 186 |
| 1986 | 0.61 | 179 |