| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.74 | 107 |
| 2015 | 1.82 | 103 |
| 2014 | 1.89 | 96 |
| 2013 | 1.92 | 96 |
| 2012 | 1.91 | 96 |
| 2011 | 1.85 | 101 |
| 2010 | 1.77 | 104 |
| 2009 | 1.7 | 114 |
| 2008 | 1.7 | 117 |
| 2007 | 1.8 | 109 |
| 2006 | 1.97 | 106 |
| 2005 | 2.16 | 96 |
| 2004 | 2.35 | 84 |
| 2003 | 2.51 | 79 |
| 2002 | 2.64 | 79 |
| 2001 | 2.73 | 78 |
| 2000 | 2.81 | 72 |
| 1999 | 2.9 | 70 |
| 1998 | 3 | 73 |
| 1997 | 3.11 | 68 |
| 1996 | 3.24 | 67 |
| 1995 | 3.37 | 61 |
| 1994 | 3.49 | 59 |
| 1993 | 3.58 | 59 |
| 1992 | 3.67 | 62 |
| 1991 | 3.91 | 63 |
| 1990 | 3.92 | 63 |
| 1989 | 3.94 | 67 |
| 1988 | 3.96 | 71 |
| 1987 | 3.98 | 73 |
| 1986 | 4 | 75 |