| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 95.93 | 51 |
| 2015 | 98.17 | 61 |
| 2014 | 106.7 | 52 |
| 2013 | 110.98 | 51 |
| 2012 | 115.18 | 50 |
| 2011 | 111.83 | 54 |
| 2010 | 100.36 | 62 |
| 2009 | 86.99 | 79 |
| 2008 | 96.79 | 80 |
| 2007 | 93.03 | 83 |
| 2006 | 87.31 | 97 |
| 2005 | 71.65 | 116 |
| 2004 | 67.2 | 129 |
| 2003 | 62.18 | 130 |
| 2002 | 58.09 | 138 |
| 2001 | 57.98 | 132 |
| 2000 | 61.3 | 119 |
| 1999 | 62.54 | 109 |
| 1998 | 57.01 | 114 |
| 1997 | 58.01 | 118 |
| 1996 | 48.48 | 134 |
| 1995 | 44.04 | 147 |
| 1994 | 39.08 | 151 |
| 1993 | 68.29 | 76 |
| 1992 | 70.52 | 71 |
| 1991 | 74.33 | 61 |
| 1990 | 71.29 | 66 |
| 1989 | 97.73 | 34 |
| 1988 | 76.25 | 52 |
| 1987 | 25.53 | 128 |
| 1986 | 33.61 | 114 |