| 1978 | 1979 | 1980 | | 1981 | 1982 | 1983 | 1984 | 1985 | | 1986 | 1987 | 1988 | 1989 | 1990 | | 1991 | 1992 | 1993 | 1994 | 1995 | | 1996 | 1997 | 1998 | 1999 | 2000 | | 2001 | 2002 | 2003 | 2004 | 2005 | | 2006 | 2007 | 2008 | 2009 | | |
|
| | | | | | | | | | 69.1 | 56.1 | 16.9 | 19.2 | 1.3 | 3.3 | 5.6 | 0.2 | 2.0 | 1.4 | 67.7 | 56.0 | 18.2 | 19.7 | 0.2 | 3.0 | 5.4 | 0.3 | 2.0 | 1.6 | 65.7 | 54.9 | 19.7 | 18.8 | 0.2 | 2.8 | 5.1 | 0.4 | 1.8 | 2.4 | | | | | | | | | | | 64.4 | 53.0 | 19.8 | 18.4 | 0.2 | 2.7 | 5.5 | 0.6 | 1.7 | 2.7 | 64.2 | 52.7 | 19.7 | 18.1 | 0.2 | 2.4 | 5.9 | 0.8 | 1.6 | 2.8 | 63.8 | 53.0 | 20.1 | 18.7 | 0.3 | 1.9 | 5.7 | 0.5 | 1.5 | 3.3 | 63.3 | 52.3 | 20.6 | 19.5 | 0.6 | 1.8 | 5.8 | 0.7 | 1.5 | 3.2 | 61.8 | 51.1 | 21.7 | 19.1 | 0.5 | 2.0 | 5.4 | 0.9 | 1.3 | 3.0 | | | | | | | | | | | 60.5 | 49.9 | 21.6 | 18.5 | 0.3 | 2.0 | 5.8 | 1.1 | 1.0 | 1.5 | 59.8 | 49.5 | 22.3 | 18.3 | 0.3 | 1.6 | 6.0 | 0.9 | 1.1 | 2.0 | 59.5 | 48.8 | 22.2 | 18.6 | 0.3 | 1.5 | 6.3 | 1.0 | 1.2 | 1.6 | 58.9 | 48.3 | 21.9 | 18.5 | 0.3 | 1.3 | 6.8 | 0.8 | 1.1 | 0.8 | 59.0 | 48.4 | 22.4 | 18.8 | 0.3 | 1.2 | 7.0 | 0.6 | 1.1 | 1.3 | | | | | | | | | | | 59.0 | 48.3 | 22.3 | 19.2 | 0.4 | 1.2 | 7.3 | 0.5 | 1.0 | 1.5 | 58.5 | 47.7 | 22.4 | 19.2 | 0.5 | 1.2 | 7.5 | 0.5 | 0.8 | 1.5 | 56.5 | 45.6 | 21.8 | 17.8 | 0.4 | 1.3 | 7.8 | 0.5 | 0.7 | 4.8 | 55.1 | 43.0 | 20.6 | 16.4 | 0.4 | 1.2 | 9.1 | 0.6 | 0.6 | 5.5 | 55.3 | 43.4 | 20.8 | 17.2 | 0.3 | 1.2 | 9.1 | 0.5 | | 4.7 | | | | | | | | | | | 53.8 | 42.7 | 20.8 | 17.1 | 0.3 | 1.1 | 8.8 | 0.5 | 0.5 | 4.0 | 53.6 | 42.5 | 20.6 | 17.1 | 0.2 | 1.0 | 8.9 | 0.5 | 0.5 | 3.8 | 53.5 | 42.3 | 20.8 | 17.1 | 0.2 | 1.0 | 9.0 | 0.5 | 0.5 | 3.7 | 52.6 | 41.0 | 19.8 | 16.8 | 0.2 | 1.0 | 9.2 | 0.5 | 0.5 | 3.0 | 45.4 | 30.8 | 13.6 | 12.2 | 0.2 | 1.5 | 10.4 | 0.8 | 1.2 | 2.6 | | | | | | | | | | | 38.0 | 21.4 | 10.0 | 7.3 | 0.3 | 1.4 | 11.3 | 0.9 | 1.9 | 3.2 | 33.5 | 16.9 | 8.7 | 4.7 | 0.3 | 1.6 | 11.5 | 0.9 | 1.8 | 4.8 | 30.1 | 14.1 | 7.5 | 3.6 | 0.3 | 1.4 | 10.8 | 0.9 | 1.9 | 4.7 | 30.4 | 15.4 | 9.4 | 3.9 | 0.7 | 1.1 | 9.1 | 0.8 | 2.8 | 3.2 | 30.8 | 19.2 | 12.0 | 5.3 | 0.2 | 0.9 | 7.9 | 0.8 | 1.5 | 1.2 | | | | | | | | | | | 32.0 | 22.0 | 13.6 | 6.3 | 0.2 | 0.7 | 7.1 | 0.9 | 0.6 | 1.3 | 29.5 | 19.7 | 13.9 | 4.1 | 0.2 | 0.7 | 7.0 | 0.9 | 0.4 | 1.1 | 32.2 | 22.6 | 14.6 | 6.4 | 0.1 | 0.7 | 6.8 | 0.8 | 0.4 | 0.9 | 32.0 | 22.6 | 15.1 | 6.1 | 0.1 | 0.6 | 6.8 | 0.8 | 0.4 | 1.0 | | | | | | | | | | | | | | | | | | | | | |