Year	per person
1800	2.626
1820	2.626
1850	3.338
1870	3.6
1890	4.656
1900	5.348
1910	6.159
1913	6.482
1920	5.98
1921	6.448
1922	6.205
1923	6.653
1924	7.278
1925	8.061
1926	7.966
1927	8.512
1928	9.209
1929	9.411
1930	9.05
1931	8.688
1932	8.289
1933	7.894
1934	7.556
1935	7.455
1936	8.038
1937	8.914
1948	9.554
1949	10.08
1950	10.83
1951	10.9
1952	11.13
1953	10.96
1954	11.3
1955	12.13
1956	12.71
1957	13.36
1958	14.26
1959	14.79
1960	15.8
1961	16.28
1962	16.41
1963	15.99
1964	16.62
1965	17.11
1966	17.76
1967	18.45
1968	19.25
1969	19.65
1970	20
1971	20.6
1972	21.22
1973	21.78
1974	22.4
1975	22.89
1976	23.08
1977	23.95
1978	24.09
1979	24.14
1980	24.69
1981	24.48
1982	24.89
1983	25.2
1984	25.73
1985	25.88
1986	26.32
1987	26.4
1988	26.94
1989	27.12
1990	26.33
1991	22.4
1992	20.83
1993	21.13
1994	22.36
1995	23.6
1996	25.18
1997	26.59
1998	27.55
1999	27.63
2000	27.83
2001	28.73
2002	29.91
2003	31.16
2004	32.85
2005	34.83
2006	37.76
2007	41.69
2008	44.18
2009	42.07