| 年/順位 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9| 10 |
| 1990 | 8.8 | 6 | 4.8 | 4.1 | 3.4 | 2.9 | 2.6 | 2.4 | 2.1| 2 | |
| 1991 | 16.3 | 8.3 | 6.3 | 5.4 | 4.7 | 3.9 | 3.4 | 3.2 | 2.9| 2.6 | |
| 1992 | 18.9 | 12.4 | 9.5 | 7.1 | 6 | 5.3 | 4.7 | 4.2 | 3.8| 3.6 | |
| 1993 | 24.6 | 15.9 | 12.5 | 10.6 | 8.9 | 7.9 | 7 | 6.4 | 5.9| 5.4 | |
| 1994 | 22.1 | 14.4 | 11.6 | 9.7 | 8.3 | 7.3 | 6.4 | 5.6 | 5.2| 4.7 | |
| 1995 | 30.2 | 18.6 | 14 | 11.7 | 9.9 | 9 | 8 | 7.2 | 6.6| 5.9 | |
| 1996 | 28.1 | 18.6 | 13.5 | 11.7 | 8.6 | 7.8 | 6.7 | 6 | 5.4| 5 | |
| 1997 | 25.8 | 15.4 | 12.2 | 10.1 | 8.5 | 7.3 | 6.5 | 5.7 | 5.3| 4.8 | |
| 1998 | 30.4 | 16.4 | 11.1 | 11.1 | 7.1 | 6.3 | 5.5 | 4.8 | 4.2| 3.8 | |
| 1999 | 32 | 15.8 | 11.1 | 8.8 | 7.3 | 6.4 | 5.5 | 4.8 | 4.3| 4.8 | |
| 2000 | 33.3 | 18.6 | 13 | 10.4 | 7.9 | 6.5 | 5.5 | 4.9 | 4.5| 4.1 | |
| 2001 | 25.5 | 12.4 | 8.9 | 7.2 | 6.1 | 5.2 | 4.5 | 3.97 | 3.6| 3.2 | |
| 2002 | 16.9 | 8.2 | 5.8 | 4.7 | 4 | 3.5 | 3 | 2.7 | 2.4| 2.2 | |
| 2003 | 15.7 | 7.1 | 5.1 | 4.2 | 3.4 | 3 | 2.7 | 2.3 | 2.1| 1.9 | |
| 2004 | 12.8 | 6.8 | 4.8 | 3.7 | 3.1 | 2.7 | 2.3 | 2 | 1.8| 1.7 | |
| 2005 | 16.2 | 7.5 | 5.6 | 4.5 | 3.5 | 2.9 | 2.5 | 2.2 | 1.9| 1.7 | |
| 2006 | 16.2 | 6.9 | 4.4 | 3.4 | 2.9 | 2.4 | 2.1 | 1.8 | 1.6| 1.4 | |
| 2007 | 13.1 | 6.6 | 4.2 | 3.1 | 2.5 | 2.1 | 1.9 | 1.6 | 1.4| 1.3 | |
| 2008 | 15.4 | 6.5 | 3.8 | 3 | 2.4 | 2 | 1.7 | 1.5 | 1.4| 1.2 | |
| 2009 | 14.2 | 5.8 | 3.3 | 2.6 | 2.1 | 1.7 | 1.5 | 1.3 | 1.2| 1.1 | |
| 2010 | 21.2 | 5.9 | 3.7 | 2.8 | 2.2 | 1.7 | 1.4 | 1.3 | 1.1| 1.0 | |
| 2011 | 27.5 | 7.9 | 4.5 | 3.3 | 2.6 | 2.1 | 1.7 | 1.4 | 1.3| 1.1 | |
| 2012 | 31.3 | 8.4 | 4.8 | 3.1 | 2.4 | 2.0 | 1.7 | 1.5 | 1.3| 1.1 | |
| 2013 | 34.4 | 8.0 | 4.8 | 3.2 | 2.5 | 2.0 | 1.7 | 1.5 | 1.4| 1.2 | |
| 2014 | 31.3 | 6.0 | 4.0 | 3.0 | 2.4 | 1.9 | 1.7 | 1.5 | 1.3| 1.1 | | |