| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.04 | 9 |
| 2015 | 18.16 | 3 |
| 2014 | 2.4 | 96 |
| 2013 | 1.85 | 108 |
| 2012 | 8.91 | 18 |
| 2011 | -14.77 | 177 |
| 2010 | 5.84 | 43 |
| 2009 | 13.03 | 15 |
| 2008 | 19.53 | 12 |
| 2007 | -5.8 | 148 |
| 2006 | -8.39 | 160 |
| 2005 | 11.02 | 18 |
| 2004 | 2.38 | 105 |
| 2003 | 17.83 | 7 |
| 2002 | -22.25 | 168 |
| 2001 | 1.27 | 93 |
| 2000 | 2.4 | 81 |
| 1999 | 13.7 | 10 |
| 1998 | 0.78 | 96 |
| 1997 | -.93 | 114 |
| 1996 | -3.68 | 134 |
| 1995 | 9.36 | 21 |
| 1994 | -.14 | 88 |
| 1993 | 7.78 | 25 |
| 1992 | -5.98 | 108 |
| 1991 | 6.06 | 28 |
| 1990 | -9.48 | 110 |
| 1989 | 13.69 | 7 |
| 1988 | -15.53 | 111 |
| 1987 | 5.6 | 28 |
| 1986 | 4.79 | 35 |