| | 1949 | | 1950-1951 | | 1950 | | 1951 | | 1952 | | 1953-1957 | | 1953 | | 1954 | | 1955 | | 1956 | | 1957 | | 1958-1962 | | 1958 | | 1959 | | 1960 | | 1961 | | 1962 | | 1963-1965 | | 1963 | | 1964 | | 1965 | | 1966-1970 | | 1966 | | 1967 | | 1968 | | 1969 | | 1970 | | 1971-1975 | | 1971 | | 1972 | | 1973 | | 1974 | | 1975 | | 1976-1980 | | 1976 | | 1977 | | 1978 | | 1979 | | 1980 | | 1981-1985 | | 1981 | | 1982 | | 1983 | | 1984 | | 1985 | | 1986-1990 | | 1986 | | 1987 | | 1988 | | 1989 | | 1990 | | 1991-1995 | | 1991 | | 1992 | | 1993 | | 1994 | | 1995 | | 1996-2000 | | 1996 | | 1997 | | 1998 | | 1999 | | 2000 | | 2001-2005 | | 2001 | | 2002 | | 2003 | | 2004 | | 2005 | | | 2006 | | 2007 | | 2008 | | |
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| | | | | | | | | 100.0 | 23.1 | 36.8 | 32.8 | 4.0 | 40.1 | 5.1 | 15.9 | | 100.0 | 22.7 | 37.6 | 33.4 | 4.2 | 39.7 | 5.2 | 15.9 | | 100.0 | 23.1 | 36.9 | 32.8 | 4.1 | 40.0 | 5.2 | 16.0 | | 100.0 | 23.0 | 36.9 | 32.9 | 4.0 | 40.1 | 5.2 | 16.1 | | 100.0 | 22.2 | 38.7 | 34.1 | 4.6 | 39.1 | 5.1 | 15.6 | | 100.0 | 13.4 | 43.8 | 33.6 | 10.2 | 42.8 | 6.1 | 17.9 | | 100.0 | 17.5 | 40.7 | 31.7 | 9.0 | 41.8 | 6.4 | 18.3 | | 100.0 | 14.2 | 44.1 | 32.4 | 11.7 | 41.7 | 5.9 | 18.1 | | 100.0 | 14.4 | 42.2 | 31.8 | 10.4 | 43.4 | 6.2 | 19.6 | | 100.0 | 12.4 | 42.4 | 32.3 | 10.1 | 45.2 | 6.4 | 19.0 | | 100.0 | 10.6 | 47.8 | 37.8 | 10.0 | 41.6 | 5.7 | 15.2 | | 100.0 | 9.5 | 60.1 | 53.7 | 6.4 | 30.4 | 5.8 | 12.3 | | 100.0 | 11.4 | 58.9 | 50.1 | 8.8 | 29.7 | 4.4 | 12.3 | | 100.0 | 8.6 | 62.0 | 54.3 | 7.7 | 29.4 | 4.3 | 14.1 | | 100.0 | 7.0 | 64.4 | 58.4 | 6.0 | 28.6 | 6.5 | 12.2 | | 100.0 | 10.2 | 55.9 | 51.5 | 4.4 | 33.9 | 7.5 | 12.6 | | 100.0 | 12.6 | 55.1 | 50.1 | 5.0 | 32.3 | 6.6 | 9.6 | | 100.0 | 12.9 | 58.3 | 52.6 | 5.7 | 28.8 | 5.7 | 8.5 | | 100.0 | 13.0 | 57.5 | 52.3 | 5.2 | 29.5 | 5.1 | 9.5 | | 100.0 | 13.4 | 58.2 | 52.6 | 5.6 | 28.4 | 5.4 | 8.7 | | 100.0 | 12.5 | 59.0 | 52.7 | 6.3 | 28.5 | 6.5 | 7.7 | | 100.0 | 11.6 | 64.8 | 60.5 | 4.3 | 23.6 | 4.6 | 8.2 | | 100.0 | 11.8 | 64.0 | 59.3 | 4.7 | 24.2 | 4.5 | 7.1 | | 100.0 | 14.0 | 59.1 | 54.8 | 4.3 | 26.9 | 4.8 | 7.9 | | 100.0 | 14.5 | 58.5 | 54.2 | 4.3 | 27.0 | 4.8 | 8.9 | | 100.0 | 9.3 | 66.4 | 62.3 | 4.1 | 24.3 | 4.2 | 10.0 | | 100.0 | 10.2 | 71.1 | 67.2 | 3.9 | 18.7 | 4.5 | 7.2 | | 100.0 | 7.9 | 68.7 | 64.7 | 4.0 | 23.4 | 5.6 | 7.5 | | 100.0 | 10.3 | 68.5 | 65.0 | 3.5 | 21.2 | 5.0 | 8.2 | | 100.0 | 8.0 | 70.0 | 66.7 | 3.3 | 22.0 | 5.0 | 7.6 | | 100.0 | 8.2 | 69.1 | 65.2 | 3.9 | 22.7 | 5.1 | 8.2 | | 100.0 | 7.0 | 70.3 | 66.0 | 4.3 | 22.7 | 5.7 | 6.1 | | 100.0 | 6.6 | 66.3 | 61.5 | 4.8 | 27.1 | 6.7 | 7.5 | | 100.0 | 4.9 | 69.4 | 63.6 | 5.8 | 25.7 | 5.9 | 7.4 | | 100.0 | 5.9 | 67.8 | 63.8 | 4.0 | 26.3 | 6.2 | 6.9 | | 100.0 | 5.2 | 67.9 | 63.1 | 4.8 | 26.9 | 6.6 | 7.3 | | 100.0 | 5.2 | 71.1 | 64.5 | 6.6 | 23.7 | 6.4 | 7.6 | | 100.0 | 4.3 | 70.9 | 64.4 | 6.5 | 24.8 | 5.5 | 7.3 | | 100.0 | 4.4 | 68.9 | 62.5 | 6.4 | 26.7 | 5.0 | 7.9 | | 100.0 | 6.6 | 62.0 | 54.2 | 7.8 | 31.4 | 5.1 | 8.5 | | 100.0 | 4.7 | 66.5 | 59.4 | 7.1 | 28.8 | 5.5 | 8.5 | | 100.0 | 6.7 | 64.4 | 57.6 | 6.8 | 28.9 | 5.3 | 7.1 | | 100.0 | 7.0 | 61.5 | 53.9 | 7.6 | 31.5 | 4.9 | 7.4 | | 100.0 | 6.9 | 60.3 | 52.6 | 7.7 | 32.8 | 4.8 | 8.5 | | 100.0 | 6.9 | 59.8 | 50.8 | 9.0 | 33.3 | 5.0 | 10.1 | | 100.0 | 8.2 | 54.8 | 46.4 | 8.4 | 37.0 | 4.6 | 9.3 | | 100.0 | 6.7 | 58.2 | 49.6 | 8.6 | 35.1 | 5.3 | 9.8 | | 100.0 | 7.4 | 55.9 | 47.3 | 8.6 | 36.7 | 5.4 | 8.3 | | 100.0 | 9.0 | 54.0 | 46.2 | 7.8 | 37.0 | 4.6 | 9.5 | | 100.0 | 8.5 | 55.3 | 46.7 | 8.6 | 36.2 | 4.1 | 8.8 | | 100.0 | 8.8 | 52.4 | 43.8 | 8.6 | 38.8 | 4.2 | 9.8 | | 100.0 | 6.0 | 45.8 | 37.8 | 8.0 | 48.2 | 5.8 | 13.8 | | 100.0 | 7.6 | 48.7 | 42.7 | 6.0 | 43.7 | 4.9 | 11.0 | | 100.0 | 6.9 | 48.8 | 41.3 | 7.5 | 44.3 | 5.0 | 12.0 | | 100.0 | 6.1 | 47.3 | 38.3 | 9.0 | 46.6 | 4.6 | 13.9 | | 100.0 | 5.9 | 45.2 | 36.5 | 8.7 | 48.9 | 6.2 | 15.0 | | 100.0 | 4.9 | 42.8 | 35.0 | 7.8 | 52.3 | 6.9 | 14.7 | | 100.0 | 3.2 | 35.4 | 28.6 | 6.8 | 61.4 | 9.1 | 13.7 | | 100.0 | 4.2 | 39.9 | 32.2 | 7.7 | 55.9 | 8.2 | 14.4 | | 100.0 | 3.6 | 37.7 | 30.7 | 7.0 | 58.7 | 8.8 | 14.4 | | 100.0 | 3.2 | 35.4 | 28.2 | 7.2 | 61.4 | 9.2 | 14.0 | | 100.0 | 2.9 | 33.9 | 27.0 | 6.9 | 63.2 | 9.3 | 13.6 | | 100.0 | 2.5 | 32.7 | 26.7 | 6.0 | 64.8 | 9.4 | 12.9 | | 100.0 | 1.7 | 29.8 | 24.8 | 5.0 | 68.5 | 6.2 | 10.2 | | 100.0 | 2.2 | 30.8 | 25.3 | 5.5 | 67.0 | 6.9 | 11.4 | | 100.0 | 1.9 | 28.9 | 23.6 | 5.3 | 69.2 | 6.5 | 10.7 | | 100.0 | 1.8 | 29.6 | 24.4 | 5.2 | 68.6 | 6.2 | 10.3 | | 100.0 | 1.6 | 30.6 | 25.7 | 4.9 | 67.8 | 5.9 | 9.7 | | 100.0 | 1.4 | 29.5 | 24.8 | 4.7 | 69.1 | 5.9 | 9.5 | | | | | | | | | | 100.0 | 1.1 | 27.9 | 23.2 | 4.7 | 71.0 | 5.8 | 9.6 | | 100.0 | 1.1 | 26.8 | 22.3 | 4.5 | 72.1 | 5.4 | 9.4 | | 100.0 | 1.1 | 25.7 | 21.0 | 4.7 | 73.2 | 4.8 | 10.1 | | | | | | | | | | | | | | | | | |