| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 73.92 | 81 |
| 2015 | 75.3 | 97 |
| 2014 | 75.4 | 111 |
| 2013 | 77.72 | 112 |
| 2012 | 76.93 | 113 |
| 2011 | 71.13 | 128 |
| 2010 | 65.2 | 135 |
| 2009 | 65.7 | 125 |
| 2008 | 78.62 | 118 |
| 2007 | 73.29 | 125 |
| 2006 | 68.72 | 128 |
| 2005 | 69.44 | 128 |
| 2004 | 66.91 | 130 |
| 2003 | 65.36 | 124 |
| 2002 | 67.51 | 113 |
| 2001 | 66.49 | 109 |
| 2000 | 65.14 | 113 |
| 1999 | 63.11 | 107 |
| 1998 | 61.96 | 108 |
| 1997 | 60.87 | 112 |
| 1996 | 59.75 | 109 |
| 1995 | 68.19 | 99 |
| 1994 | 70.82 | 81 |
| 1993 | 49.64 | 117 |
| 1992 | 53.09 | 107 |
| 1991 | 54.01 | 98 |
| 1990 | 57.6 | 90 |
| 1989 | 55.37 | 80 |
| 1988 | 51.89 | 81 |
| 1987 | 50.2 | 81 |
| 1986 | 57.21 | 70 |