| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.83 | 58 |
| 2015 | -.08 | 177 |
| 2014 | 1.64 | 129 |
| 2013 | -.04 | 174 |
| 2012 | 2.27 | 116 |
| 2011 | 0.82 | 162 |
| 2010 | 0.2 | 174 |
| 2009 | -.04 | 175 |
| 2008 | 1.94 | 140 |
| 2007 | 3.16 | 127 |
| 2006 | 2.61 | 127 |
| 2005 | 1.66 | 136 |
| 2004 | 2.23 | 108 |
| 2003 | -3.81 | 186 |
| 2002 | 4.28 | 56 |
| 2001 | 0.48 | 149 |
| 2000 | -2.87 | 176 |
| 1999 | 1.95 | 97 |
| 1998 | 2.28 | 95 |
| 1997 | 3.73 | 51 |
| 1996 | 3.33 | 38 |
| 1995 | 5.19 | 26 |
| 1994 | 4.51 | 20 |
| 1993 | 5.12 | 24 |
| 1992 | 4.64 | 15 |
| 1991 | 3.02 | 28 |
| 1990 | 3.81 | 19 |
| 1989 | 3.7 | 21 |
| 1988 | 3.8 | 17 |
| 1987 | 3.18 | 18 |
| 1986 | 3.97 | 11 |