| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.77 | 28 |
| 2015 | 10.72 | 9 |
| 2014 | 13.68 | 11 |
| 2013 | 19.18 | 8 |
| 2012 | 21.05 | 3 |
| 2011 | -.32 | 146 |
| 2010 | -16.6 | 173 |
| 2009 | 3.63 | 62 |
| 2008 | 4.67 | 74 |
| 2007 | 14.44 | 8 |
| 2006 | 6.53 | 30 |
| 2005 | 11.28 | 17 |
| 2004 | 16.23 | 14 |
| 2003 | 4.78 | 52 |
| 2002 | -10.99 | 160 |
| 2001 | -19.15 | 166 |
| 2000 | -16.33 | 159 |
| 1999 | 2.86 | 83 |
| 1998 | 5.16 | 42 |
| 1997 | 4.44 | 47 |
| 1996 | 2.11 | 94 |
| 1995 | 0.24 | 93 |
| 1994 | 1.85 | 64 |
| 1993 | -.83 | 88 |
| 1992 | -2.14 | 91 |
| 1991 | -9.88 | 116 |
| 1990 | 16.95 | 9 |
| 1989 | 7.7 | 18 |
| 1988 | 2.34 | 67 |
| 1987 | -12.89 | 104 |
| 1986 | 4.54 | 38 |