Content analysis

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1942 1963 1970 1980 1990 2000 2010
1949 1965 1971 1981 1991 2001 2011
1952 1966 1972 1982 1992 2002 2012
1955 1967 1973 1983 1993 2003  
1959 1968 1974 1984 1994 2004  
  1969 1975 1985 1995 2005  
    1976 1986 1996 2006  
    1977 1987 1997 2007  
    1978 1988 1998 2008  
    1979 1989 1999 2009