| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.18 | 135 |
| 2015 | 0.74 | 158 |
| 2014 | 0.37 | 174 |
| 2013 | 0.2 | 180 |
| 2012 | 0.3 | 176 |
| 2011 | 0.61 | 158 |
| 2010 | 0.99 | 143 |
| 2009 | 1.32 | 126 |
| 2008 | 1.57 | 121 |
| 2007 | 1.68 | 116 |
| 2006 | 1.69 | 118 |
| 2005 | 1.69 | 117 |
| 2004 | 1.72 | 114 |
| 2003 | 1.73 | 117 |
| 2002 | 1.72 | 118 |
| 2001 | 1.7 | 120 |
| 2000 | 1.65 | 120 |
| 1999 | 1.61 | 116 |
| 1998 | 1.61 | 117 |
| 1997 | 1.68 | 118 |
| 1996 | 1.82 | 113 |
| 1995 | 1.98 | 110 |
| 1994 | 2.15 | 105 |
| 1993 | 2.29 | 105 |
| 1992 | 2.39 | 106 |
| 1991 | 2.47 | 109 |
| 1990 | 2.53 | 105 |
| 1989 | 2.61 | 109 |
| 1988 | 2.73 | 105 |
| 1987 | 2.91 | 101 |
| 1986 | 3.14 | 99 |