| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.24 | 129 |
| 2015 | -.15 | 147 |
| 2014 | 1.56 | 107 |
| 2013 | 1.92 | 99 |
| 2012 | 4.41 | 39 |
| 2011 | 2.5 | 96 |
| 2010 | 7.16 | 20 |
| 2009 | 6.19 | 10 |
| 2008 | 4.84 | 52 |
| 2007 | 5.44 | 69 |
| 2006 | 5.02 | 75 |
| 2005 | 4.38 | 73 |
| 2004 | 4.21 | 83 |
| 2003 | 4.12 | 61 |
| 2002 | 1.72 | 95 |
| 2001 | 2.47 | 75 |
| 2000 | 1.02 | 142 |
| 1999 | 1.69 | 101 |
| 1998 | -3.23 | 175 |
| 1997 | 0.89 | 140 |
| 1996 | 3.31 | 80 |
| 1995 | 0.18 | 139 |
| 1994 | -10.96 | 171 |
| 1993 | 4.13 | 37 |
| 1992 | -4.2 | 140 |
| 1991 | -2.61 | 131 |
| 1990 | -3.13 | 133 |
| 1989 | -3.73 | 141 |
| 1988 | 3.28 | 69 |
| 1987 | -.31 | 113 |
| 1986 | -2.3 | 132 |