| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 17.72 | 171 |
| 2015 | 20.66 | 178 |
| 2014 | 27.12 | 179 |
| 2013 | 30.76 | 177 |
| 2012 | 35.95 | 169 |
| 2011 | 41.77 | 164 |
| 2010 | 34.75 | 172 |
| 2009 | 53.49 | 100 |
| 2008 | 65.47 | 99 |
| 2007 | 60.94 | 108 |
| 2006 | 58.62 | 110 |
| 2005 | 63.45 | 84 |
| 2004 | 60.1 | 94 |
| 2003 | 51.56 | 106 |
| 2002 | 43.17 | 132 |
| 2001 | 67.13 | 68 |
| 2000 | 64.02 | 72 |
| 1999 | 62.57 | 72 |
| 1998 | 59.57 | 77 |
| 1997 | 68.97 | 60 |
| 1996 | 64.57 | 68 |
| 1995 | 72.04 | 52 |
| 1994 | 88.62 | 21 |
| 1993 | 110.3 | 11 |
| 1992 | 68.81 | 45 |
| 1991 | 77.57 | 31 |
| 1990 | 62.5 | 51 |
| 1989 | 58.55 | 54 |
| 1988 | 49.81 | 72 |
| 1987 | 46.81 | 79 |
| 1986 | 44.35 | 78 |