| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.8 | 84 |
| 2015 | 0.52 | 129 |
| 2014 | 1.85 | 94 |
| 2013 | 1.67 | 104 |
| 2012 | 1.69 | 93 |
| 2011 | 1.49 | 130 |
| 2010 | 0.4 | 154 |
| 2009 | -1.3 | 97 |
| 2008 | -1.96 | 179 |
| 2007 | 1.93 | 142 |
| 2006 | 1.56 | 157 |
| 2005 | 2.14 | 134 |
| 2004 | 2.41 | 126 |
| 2003 | 2.51 | 100 |
| 2002 | 2.87 | 68 |
| 2001 | 2.84 | 68 |
| 2000 | 2.3 | 122 |
| 1999 | 4.9 | 35 |
| 1998 | -.08 | 148 |
| 1997 | 0.7 | 147 |
| 1996 | 2 | 113 |
| 1995 | 3.21 | 67 |
| 1994 | 3.75 | 53 |
| 1993 | 5.19 | 25 |
| 1992 | 0.06 | 95 |
| 1991 | -5.77 | 150 |
| 1990 | -.77 | 111 |
| 1989 | -.33 | 117 |
| 1988 | -.63 | 126 |
| 1987 | 0.08 | 106 |
| 1986 | 2.73 | 58 |