| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.772 | 84 |
| 2015 | 1.981 | 95 |
| 2014 | 2.586 | 94 |
| 2013 | 2.935 | 92 |
| 2012 | 4.525 | 65 |
| 2011 | 4.276 | 67 |
| 2010 | 4.276 | 69 |
| 2009 | 4.96 | 73 |
| 2008 | 5.124 | 79 |
| 2007 | 3.55 | 125 |
| 2006 | 2.2 | 146 |
| 2005 | 2.79 | 117 |
| 2004 | 3.752 | 87 |
| 2003 | 3.709 | 95 |
| 2002 | 6.205 | 63 |
| 2001 | 11.796 | 28 |
| 2000 | 14.173 | 23 |
| 1999 | 11.223 | 45 |
| 1998 | 18.22 | 24 |
| 1997 | 19.191 | 21 |
| 1996 | 20.017 | 25 |
| 1995 | 26.783 | 20 |
| 1994 | 33.4 | 16 |
| 1993 | 37.131 | 11 |
| 1992 | 41.227 | 12 |
| 1991 | 58.427 | 8 |
| 1990 | 102.865 | 6 |
| 1989 | 246.876 | 6 |