| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.196 | 114 |
| 2015 | 3.276 | 83 |
| 2014 | 3.879 | 84 |
| 2013 | 6.982 | 34 |
| 2012 | 4.555 | 76 |
| 2011 | 6.626 | 46 |
| 2010 | 12.819 | 8 |
| 2009 | -1.041 | 121 |
| 2008 | 3.646 | 104 |
| 2007 | 9.112 | 49 |
| 2006 | 8.205 | 45 |
| 2005 | 7.556 | 55 |
| 2004 | 9.183 | 34 |
| 2003 | 5.509 | 54 |
| 2002 | 4.541 | 70 |
| 2001 | 2.392 | 108 |
| 2000 | 7.894 | 26 |
| 1999 | 5.705 | 36 |
| 1998 | -2.61 | 146 |
| 1997 | 9.059 | 22 |
| 1996 | 8.195 | 20 |
| 1995 | 6.191 | 30 |
| 1994 | 9.967 | 13 |
| 1993 | 12.329 | 7 |
| 1992 | 7.792 | 18 |
| 1991 | 6.923 | 22 |
| 1990 | 10.654 | 11 |
| 1989 | 10.68 | 12 |
| 1988 | 10.604 | 11 |
| 1987 | 11.203 | 12 |
| 1986 | 2.79 | 64 |