| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.3 | 124 |
| 2015 | 1.32 | 145 |
| 2014 | 1.34 | 152 |
| 2013 | 1.39 | 156 |
| 2012 | 1.49 | 154 |
| 2011 | 1.63 | 150 |
| 2010 | 1.62 | 151 |
| 2009 | 1.48 | 150 |
| 2008 | 1.6 | 152 |
| 2007 | 1.59 | 153 |
| 2006 | 1.35 | 158 |
| 2005 | 1.14 | 158 |
| 2004 | 1.8 | 154 |
| 2003 | 1.82 | 153 |
| 2002 | 1.84 | 153 |
| 2001 | 1.9 | 151 |
| 2000 | 1.9 | 150 |
| 1999 | 2.11 | 146 |
| 1998 | 2.26 | 147 |
| 1997 | 2.42 | 147 |
| 1996 | 2.5 | 147 |
| 1995 | 2.8 | 144 |
| 1994 | 2.78 | 129 |
| 1993 | 2.72 | 125 |
| 1992 | 2.88 | 123 |
| 1991 | 3.06 | 120 |
| 1990 | 3.56 | 113 |
| 1989 | 3.87 | 101 |
| 1988 | 3.94 | 98 |
| 1987 | 4.12 | 98 |
| 1986 | 4.31 | 94 |