| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.8 | 106 |
| 2015 | 1.37 | 120 |
| 2014 | 1 | 140 |
| 2013 | 0.82 | 143 |
| 2012 | 0.89 | 138 |
| 2011 | 1.15 | 130 |
| 2010 | 1.49 | 118 |
| 2009 | 1.79 | 108 |
| 2008 | 2.01 | 101 |
| 2007 | 2.1 | 94 |
| 2006 | 2.08 | 99 |
| 2005 | 2.04 | 99 |
| 2004 | 2.04 | 97 |
| 2003 | 2.09 | 97 |
| 2002 | 2.17 | 99 |
| 2001 | 2.25 | 98 |
| 2000 | 2.33 | 91 |
| 1999 | 2.39 | 88 |
| 1998 | 2.47 | 88 |
| 1997 | 2.56 | 87 |
| 1996 | 2.66 | 85 |
| 1995 | 2.79 | 79 |
| 1994 | 2.9 | 80 |
| 1993 | 2.94 | 82 |
| 1992 | 2.88 | 85 |
| 1991 | 2.73 | 100 |
| 1990 | 2.53 | 106 |
| 1989 | 2.67 | 105 |
| 1988 | 2.98 | 97 |
| 1987 | 3.08 | 99 |
| 1986 | 3.3 | 91 |