| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.12 | 88 |
| 2015 | 3.52 | 117 |
| 2014 | 4.97 | 124 |
| 2013 | 3.04 | 140 |
| 2012 | 11.3 | 69 |
| 2011 | 2.65 | 138 |
| 2010 | 2.64 | 144 |
| 2009 | 10.09 | 84 |
| 2008 | 5.6 | 135 |
| 2007 | 10.17 | 137 |
| 2006 | 11.19 | 131 |
| 2005 | 5.47 | 145 |
| 2004 | 6.55 | 130 |
| 2003 | 8.41 | 110 |
| 2002 | 9.45 | 95 |
| 2001 | 5.25 | 129 |
| 2000 | -3.2 | 154 |
| 1999 | 8.67 | 112 |
| 1998 | 3.16 | 122 |
| 1997 | 4.85 | 134 |
| 1996 | 6.35 | 125 |
| 1995 | 20.69 | 58 |
| 1994 | 5.06 | 127 |
| 1993 | -1.11 | 128 |
| 1992 | 14.03 | 75 |
| 1991 | 14.36 | 76 |
| 1990 | 18.82 | 54 |
| 1989 | 9.07 | 92 |
| 1988 | 10.03 | 84 |
| 1987 | 29.59 | 30 |
| 1986 | 14.87 | 60 |