| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.72 | 126 |
| 2014 | 2.57 | 108 |
| 2013 | -4.29 | 183 |
| 2012 | -7.36 | 186 |
| 2011 | 0.21 | 176 |
| 2010 | 2.48 | 112 |
| 2009 | 3.7 | 81 |
| 2008 | 10.05 | 35 |
| 2007 | 3.84 | 115 |
| 2006 | 4.81 | 87 |
| 2005 | 5.88 | 57 |
| 2004 | 7.52 | 33 |
| 2003 | 7.15 | 30 |
| 2002 | 11.19 | 10 |
| 2001 | 9.46 | 18 |
| 2000 | 8.33 | 23 |
| 1999 | 9.45 | 21 |
| 1998 | 12.07 | 9 |
| 1997 | 17.42 | 6 |
| 1996 | 6.17 | 20 |
| 1995 | 5.61 | 22 |
| 1994 | 10.43 | 10 |
| 1993 | 8.12 | 9 |
| 1992 | 3.27 | 26 |
| 1991 | 3.19 | 25 |
| 1990 | 2.16 | 37 |
| 1989 | 3.44 | 23 |
| 1988 | 1.4 | 39 |
| 1987 | 0.69 | 64 |
| 1986 | -.3 | 125 |