| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 63.284 | 56 |
| 2015 | 61.589 | 81 |
| 2014 | 59.042 | 96 |
| 2013 | 57.267 | 103 |
| 2012 | 57.581 | 101 |
| 2011 | 51.151 | 123 |
| 2010 | 52.387 | 116 |
| 2009 | 56.321 | 106 |
| 2008 | 55.655 | 103 |
| 2007 | 57.859 | 98 |
| 2006 | 54.396 | 105 |
| 2005 | 54.471 | 106 |
| 2004 | 50.976 | 118 |
| 2003 | 52.324 | 115 |
| 2002 | 50.544 | 119 |
| 2001 | 49.862 | 117 |
| 2000 | 54.465 | 99 |
| 1999 | 52.001 | 100 |
| 1998 | 48.336 | 116 |
| 1997 | 42.786 | 122 |
| 1996 | 41.86 | 124 |
| 1995 | 42.476 | 123 |
| 1994 | 32.179 | 130 |
| 1993 | 35.266 | 114 |
| 1992 | 36.623 | 107 |
| 1991 | 34.818 | 111 |
| 1990 | 26.316 | 121 |