Year per person 1800 0.908 1820 0.908 1913 1.403 1950 2.418 1951 2.498 1952 2.518 1953 2.556 1954 2.638 1955 2.658 1956 2.694 1957 2.73 1958 2.738 1959 2.825 1960 3.133 1961 3.446 1962 4.071 1963 4.196 1964 4.692 1965 5.286 1966 5.37 1967 5.73 1968 5.325 1969 5.405 1970 6.825 1971 6.754 1972 7.379 1973 7.569 1974 8.192 1975 8.254 1976 8.287 1977 8.293 1978 8.255 1979 8.117 1980 8.037 1981 8.318 1982 8.543 1983 8.295 1984 8.171 1985 8.372 1986 8.362 1987 8.739 1988 8.142 1989 8.306 1990 8.163 1991 7.996 1992 7.792 1993 7.809 1994 8.028 1995 8.271 1996 8.38 1997 8.502 1998 8.597 1999 8.749 2000 8.818 2001 8.874 2002 9.053 2003 9.225 2004 9.399 2005 9.614 2006 9.856 2007 10.16 2008 10.36 2009 10.37