| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.22 | 73 |
| 2015 | 2.18 | 75 |
| 2014 | 0.67 | 140 |
| 2013 | -.08 | 150 |
| 2012 | -.01 | 144 |
| 2011 | -.34 | 164 |
| 2010 | 3.09 | 88 |
| 2009 | 2.76 | 35 |
| 2008 | 5.28 | 43 |
| 2007 | 5.23 | 75 |
| 2006 | 4.97 | 77 |
| 2005 | 2.58 | 120 |
| 2004 | 2.16 | 137 |
| 2003 | 1.25 | 135 |
| 2002 | 0.45 | 133 |
| 2001 | 1.62 | 100 |
| 2000 | 3.44 | 81 |
| 1999 | 4.17 | 45 |
| 1998 | 2.14 | 105 |
| 1997 | 3.55 | 72 |
| 1996 | 3.02 | 88 |
| 1995 | 2.64 | 82 |
| 1994 | 1.94 | 89 |
| 1993 | 0.82 | 88 |
| 1992 | 2.2 | 62 |
| 1991 | -1.23 | 112 |
| 1990 | 3.11 | 57 |
| 1989 | 2.24 | 72 |
| 1988 | 2.44 | 90 |
| 1987 | -.3 | 112 |
| 1986 | -.14 | 111 |