| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0 | 99 |
| 2015 | -.29 | 141 |
| 2014 | 0.2 | 145 |
| 2013 | 0.5 | 159 |
| 2012 | 1.69 | 154 |
| 2011 | 2.58 | 155 |
| 2010 | -.95 | 174 |
| 2009 | -4.48 | 175 |
| 2008 | 4.05 | 153 |
| 2007 | 4.88 | 94 |
| 2006 | 3.94 | 97 |
| 2005 | 2.43 | 129 |
| 2004 | 2.19 | 122 |
| 2003 | 3.48 | 84 |
| 2002 | 4.65 | 65 |
| 2001 | 4.87 | 70 |
| 2000 | 5.56 | 57 |
| 1999 | 1.64 | 112 |
| 1998 | 2.43 | 112 |
| 1997 | 1.44 | 142 |
| 1996 | 1.69 | 141 |
| 1995 | 2.51 | 132 |
| 1994 | 2.35 | 129 |
| 1993 | 1.41 | 130 |
| 1992 | 3.12 | 108 |
| 1991 | 3.19 | 115 |
| 1990 | 3.27 | 108 |
| 1989 | 4.12 | 97 |
| 1988 | 2.16 | 105 |
| 1987 | 3.12 | 91 |
| 1986 | 3.82 | 78 |