| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.96 | 115 |
| 2015 | 5.56 | 33 |
| 2014 | 5.45 | 46 |
| 2013 | 6.08 | 34 |
| 2012 | 1.88 | 128 |
| 2011 | 2.71 | 122 |
| 2010 | 2.95 | 126 |
| 2009 | -1.39 | 120 |
| 2008 | 1.03 | 155 |
| 2007 | -.85 | 195 |
| 2006 | 1.85 | 180 |
| 2005 | 0.7 | 190 |
| 2004 | 5.3 | 91 |
| 2003 | 1 | 163 |
| 2002 | 3.2 | 101 |
| 2001 | 2 | 129 |
| 2000 | -1.7 | 187 |
| 1999 | 8.8 | 17 |
| 1998 | 1.3 | 154 |
| 1997 | -2.2 | 181 |
| 1996 | 4.8 | 82 |
| 1995 | 2.5 | 127 |
| 1994 | 5.1 | 61 |
| 1993 | 2.13 | 95 |
| 1992 | 6.1 | 44 |
| 1991 | -2.7 | 148 |
| 1990 | 5.8 | 40 |
| 1989 | 7.44 | 24 |
| 1988 | 0.96 | 131 |
| 1987 | -6.62 | 156 |
| 1986 | 7.75 | 26 |