| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 15.085 | 2 |
| 2015 | 14.887 | 5 |
| 2014 | 14.682 | 6 |
| 2013 | 14.503 | 8 |
| 2012 | 14.509 | 7 |
| 2011 | 14.59 | 3 |
| 2010 | 14.801 | 5 |
| 2009 | 16.409 | 4 |
| 2008 | 16.153 | 4 |
| 2007 | 10.707 | 17 |
| 2006 | 10.263 | 18 |
| 2005 | 11.626 | 14 |
| 2004 | 12.599 | 15 |
| 2003 | 17.208 | 11 |
| 2002 | 29.001 | 5 |
| 2001 | 15.512 | 15 |
| 2000 | 16.3 | 18 |
| 1999 | 21.278 | 18 |
| 1998 | 34.842 | 9 |
| 1997 | 14.696 | 36 |
| 1996 | 27.578 | 16 |
| 1995 | 24.719 | 22 |
| 1994 | 39.021 | 12 |
| 1993 | 53.745 | 9 |
| 1992 | 35.432 | 14 |
| 1991 | 31.104 | 15 |
| 1990 | 27.822 | 16 |
| 1989 | 28.911 | 14 |
| 1988 | 8.948 | 50 |
| 1987 | 8.943 | 45 |
| 1986 | 8.926 | 49 |