| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 12.446 | 7 |
| 2015 | 12.622 | 11 |
| 2014 | 10.024 | 16 |
| 2013 | 7.807 | 30 |
| 2012 | 7.907 | 40 |
| 2011 | 10.992 | 15 |
| 2010 | 8.87 | 24 |
| 2009 | 9.279 | 25 |
| 2008 | 11.655 | 13 |
| 2007 | 10.577 | 18 |
| 2006 | 13.932 | 4 |
| 2005 | 17.629 | 3 |
| 2004 | 15.416 | 7 |
| 2003 | 21.971 | 7 |
| 2002 | 19.143 | 11 |
| 2001 | 17.857 | 11 |
| 2000 | 17.199 | 16 |
| 1999 | 26.023 | 10 |
| 1998 | 28.003 | 14 |
| 1997 | 24.351 | 15 |
| 1996 | 26.448 | 17 |
| 1995 | 52.246 | 9 |
| 1994 | 5175.241 | 1 |
| 1993 | 3293.502 | 1 |
| 1992 | 1560.182 | 1 |
| 1991 | 913.467 | 1 |
| 1990 | 9394.293 | 1 |
| 1989 | 5844.984 | 2 |
| 1988 | 859.427 | 2 |
| 1987 | 401.025 | 1 |
| 1986 | 109.475 | 2 |