| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 0 | 143 |
| 2014 | 0 | 144 |
| 2013 | 0 | 154 |
| 2012 | 0.9 | 123 |
| 2011 | 1.2 | 122 |
| 2010 | 0.9 | 120 |
| 2001 | 1.6 | 129 |
| 2000 | 2.3 | 123 |
| 1999 | 2.2 | 125 |
| 1998 | 3.3 | 123 |
| 1997 | 3.3 | 121 |
| 1996 | 3.3 | 117 |
| 1995 | 3.1 | 116 |
| 1994 | 3 | 119 |
| 1993 | 3 | 118 |
| 1992 | 3 | 117 |
| 1991 | 2.8 | 114 |
| 1990 | 2.8 | 116 |
| 1989 | 2.8 | 113 |
| 1988 | 2.6 | 115 |
| 1987 | 2.5 | 117 |
| 1986 | 2.4 | 115 |