| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.95 | 5 |
| 2015 | 0.35 | 126 |
| 2014 | 0.97 | 115 |
| 2013 | 3.66 | 79 |
| 2012 | 5.09 | 48 |
| 2011 | 1.42 | 132 |
| 2010 | 9.19 | 39 |
| 2009 | -3.19 | 94 |
| 2008 | -3.96 | 158 |
| 2007 | 7.63 | 58 |
| 2006 | 11.83 | 34 |
| 2005 | 2.75 | 110 |
| 2004 | 1.16 | 141 |
| 2003 | 2.17 | 110 |
| 2002 | 6.7 | 48 |
| 2001 | 0.54 | 114 |
| 2000 | 1.94 | 118 |
| 1999 | 0.64 | 117 |
| 1998 | 2.61 | 93 |
| 1997 | 6.24 | 58 |
| 1996 | 1.67 | 110 |
| 1995 | 4.44 | 65 |
| 1994 | 4.11 | 68 |
| 1993 | 1.23 | 70 |
| 1992 | 5.11 | 47 |
| 1991 | 0.71 | 73 |
| 1990 | 19.06 | 5 |
| 1989 | 8.3 | 24 |
| 1988 | 21.27 | 4 |
| 1987 | 55.37 | 2 |
| 1986 | 33.85 | 2 |