| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.409 | 84 |
| 2015 | 7.461 | 88 |
| 2014 | 8.277 | 88 |
| 2013 | 9.05 | 84 |
| 2012 | 9.714 | 78 |
| 2011 | 10.629 | 67 |
| 2010 | 11.144 | 60 |
| 2009 | 11.335 | 74 |
| 2008 | 10.861 | 81 |
| 2007 | 9.998 | 93 |
| 2006 | 8.893 | 99 |
| 2005 | 8.661 | 101 |
| 2004 | 8.871 | 101 |
| 2003 | 8.543 | 102 |
| 2002 | 9.208 | 102 |
| 2001 | 11.111 | 95 |
| 2000 | 11.343 | 99 |
| 1999 | 13.498 | 83 |
| 1998 | 14.083 | 85 |
| 1997 | 213.018 | 1 |
| 1996 | 291.06 | 1 |
| 1995 | 79.362 | 8 |
| 1994 | 102.516 | 5 |
| 1993 | 76.856 | 9 |
| 1992 | 74.05 | 5 |
| 1991 | 52.541 | 6 |