| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.2 | 49 |
| 2015 | 3.05 | 88 |
| 2014 | 3.32 | 95 |
| 2013 | 2.26 | 126 |
| 2012 | 3.03 | 103 |
| 2011 | 1.45 | 155 |
| 2010 | 0.26 | 174 |
| 2009 | -4.01 | 153 |
| 2008 | 7.13 | 41 |
| 2007 | 6.24 | 91 |
| 2006 | 5.02 | 113 |
| 2005 | 4.6 | 101 |
| 2004 | 5.26 | 93 |
| 2003 | 9.78 | 19 |
| 2002 | -12.67 | 199 |
| 2001 | 6.02 | 33 |
| 2000 | 4.76 | 82 |
| 1999 | 4.66 | 57 |
| 1998 | 3.93 | 93 |
| 1997 | 3.69 | 115 |
| 1996 | 2.15 | 142 |
| 1995 | 1.71 | 145 |
| 1994 | -.07 | 151 |
| 1993 | 2.1 | 98 |
| 1992 | 1.19 | 100 |
| 1991 | -6.31 | 159 |
| 1990 | 3.13 | 88 |
| 1989 | 4.08 | 76 |
| 1988 | 3.4 | 103 |
| 1987 | 1.18 | 121 |
| 1986 | 1.96 | 112 |