| 时间 | 值 | 世界排名 |
|---|---|---|
| 2013 | 3.1 | 105 |
| 2012 | 2.6 | 124 |
| 2011 | 2.6 | 123 |
| 2010 | 2.3 | 130 |
| 2009 | 2 | 136 |
| 2008 | 1.6 | 125 |
| 2007 | 1.7 | 130 |
| 2006 | 1.9 | 125 |
| 2005 | 2.1 | 117 |
| 2004 | 2.2 | 111 |
| 2003 | 2.3 | 102 |
| 2002 | 2 | 119 |
| 2001 | 1.8 | 109 |
| 2000 | 1.4 | 124 |
| 1999 | 1.5 | 122 |
| 1998 | 1.4 | 119 |
| 1997 | 1.2 | 132 |
| 1996 | 1.1 | 123 |
| 1995 | 1.5 | 111 |
| 1994 | 1.2 | 113 |
| 1993 | 1.1 | 119 |
| 1992 | 1.4 | 101 |
| 1991 | 1 | 113 |
| 1990 | 0.8 | 107 |
| 1989 | 0.9 | 103 |
| 1988 | 1.1 | 101 |
| 1987 | 0.9 | 108 |
| 1986 | 1 | 101 |