Year	per person
1800	0.9668
1820	0.9668
1913	1.007
1950	1.023
1951	1.057
1952	1.064
1953	1.079
1954	1.112
1955	1.118
1956	1.13
1957	1.142
1958	1.142
1959	1.174
1960	1.215
1961	1.373
1962	1.315
1963	1.283
1964	1.326
1965	1.424
1966	1.608
1967	1.611
1968	1.582
1969	1.696
1970	1.48
1971	1.597
1972	1.658
1973	1.679
1974	1.948
1975	1.768
1976	1.91
1977	1.94
1978	1.782
1979	2.005
1980	1.749
1981	1.679
1982	1.833
1983	1.56
1984	1.467
1985	1.297
1986	1.319
1987	1.341
1988	1.429
1989	1.473
1990	1.478
1991	1.453
1992	1.46
1993	1.49
1994	1.488
1995	1.384
1996	1.416
1997	1.434
1998	1.433
1999	1.475
2000	1.507
2001	1.544
2002	1.449
2003	1.499
2004	1.559
2005	1.592
2006	1.653
2007	1.713
2008	1.772
2009	1.806