| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.815 | 50 |
| 2015 | 3.609 | 62 |
| 2014 | 3.919 | 65 |
| 2013 | 5.169 | 53 |
| 2012 | 5.788 | 52 |
| 2011 | 5.287 | 58 |
| 2010 | 1.751 | 126 |
| 2009 | 2.048 | 129 |
| 2008 | 7.489 | 56 |
| 2007 | 5.61 | 73 |
| 2006 | 5.106 | 67 |
| 2005 | 3.932 | 85 |
| 2004 | 1.937 | 126 |
| 2003 | 2.734 | 115 |
| 2002 | 3.8 | 101 |
| 2001 | 6.187 | 71 |
| 2000 | 9.201 | 53 |
| 1999 | 8.56 | 62 |
| 1998 | 14.918 | 35 |
| 1997 | 12.018 | 50 |
| 1996 | 13.482 | 49 |
| 1995 | 13.734 | 43 |
| 1994 | 15.119 | 31 |
| 1993 | 18.241 | 29 |
| 1992 | 18.295 | 27 |
| 1991 | 22.349 | 25 |
| 1990 | 40.354 | 10 |
| 1989 | 27.789 | 15 |
| 1988 | 15.164 | 23 |
| 1987 | 25.285 | 10 |
| 1986 | 19.041 | 11 |