| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.37 | 128 |
| 2015 | -2.28 | 171 |
| 2014 | 3.65 | 44 |
| 2013 | 0.28 | 141 |
| 2012 | -1.52 | 167 |
| 2011 | -.62 | 168 |
| 2010 | 0.38 | 155 |
| 2009 | -1.38 | 98 |
| 2008 | 6.93 | 24 |
| 2007 | 6.11 | 57 |
| 2006 | 2.67 | 130 |
| 2005 | -.44 | 185 |
| 2004 | 2.83 | 121 |
| 2003 | 7.27 | 28 |
| 2002 | -1.97 | 170 |
| 2001 | 0.48 | 132 |
| 2000 | 0.7 | 147 |
| 1999 | 1.24 | 116 |
| 1998 | 5.67 | 28 |
| 1997 | 2.05 | 115 |
| 1996 | 2.96 | 89 |
| 1995 | 1.98 | 101 |
| 1994 | 1.2 | 103 |
| 1993 | 1.34 | 83 |
| 1992 | 1.86 | 67 |
| 1991 | 0.73 | 85 |
| 1990 | 5.72 | 22 |
| 1989 | 0.46 | 109 |
| 1988 | 9.51 | 15 |
| 1987 | 8.49 | 13 |
| 1986 | 7.98 | 13 |