| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.92 | 47 |
| 2015 | 2.58 | 68 |
| 2014 | 0.51 | 143 |
| 2013 | 2.28 | 85 |
| 2012 | 6.75 | 15 |
| 2011 | 0.36 | 154 |
| 2010 | 6.99 | 22 |
| 2009 | -1.19 | 96 |
| 2008 | 1.19 | 127 |
| 2007 | 4.84 | 86 |
| 2006 | 4.33 | 88 |
| 2005 | 3.51 | 88 |
| 2004 | 5.56 | 56 |
| 2003 | 6.39 | 34 |
| 2002 | 5.27 | 29 |
| 2001 | 2.49 | 73 |
| 2000 | 3.37 | 86 |
| 1999 | 3.38 | 64 |
| 1998 | -8.73 | 190 |
| 1997 | -3.89 | 182 |
| 1996 | 4.49 | 55 |
| 1995 | 7.05 | 22 |
| 1994 | 7.01 | 16 |
| 1993 | 7.27 | 13 |
| 1992 | 7 | 18 |
| 1991 | 7.28 | 10 |
| 1990 | 9.62 | 9 |
| 1989 | 10.42 | 4 |
| 1988 | 11.33 | 6 |
| 1987 | 7.55 | 21 |
| 1986 | 3.63 | 43 |