| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.9 | 80 |
| 2015 | 2.78 | 83 |
| 2014 | 2.93 | 92 |
| 2013 | 1.03 | 122 |
| 2012 | 0.61 | 115 |
| 2011 | 6.28 | 62 |
| 2010 | 9.99 | 36 |
| 2009 | -6.39 | 117 |
| 2008 | 5.9 | 56 |
| 2007 | 6.45 | 75 |
| 2006 | 4.41 | 99 |
| 2005 | 4.76 | 76 |
| 2004 | 3.62 | 106 |
| 2003 | 3.87 | 87 |
| 2002 | 2.74 | 94 |
| 2001 | 4.13 | 61 |
| 2000 | 4.09 | 90 |
| 1999 | 2.21 | 97 |
| 1998 | 3.84 | 84 |
| 1997 | 5.81 | 64 |
| 1996 | 2.93 | 94 |
| 1995 | 2.87 | 82 |
| 1994 | 3.31 | 81 |
| 1993 | -.95 | 86 |
| 1992 | 2.52 | 59 |
| 1991 | 0.49 | 76 |
| 1990 | 8.02 | 27 |
| 1989 | -2.61 | 102 |
| 1988 | 9.76 | 23 |
| 1987 | 0.78 | 81 |
| 1986 | -.26 | 86 |