Year	per person
1800	2.691
1820	2.747
1870	2.829
1890	3.981
1900	4.26
1910	4.992
1913	4.992
1920	4.87
1921	4.918
1922	4.991
1923	5.176
1924	5.47
1925	5.657
1926	5.967
1927	5.787
1928	6.207
1929	6.443
1930	6.227
1931	5.954
1932	5.326
1933	5.416
1934	5.541
1935	5.383
1936	5.998
1937	6.014
1938	6.406
1939	6.668
1947	6.213
1948	7.313
1949	7.927
1950	7.325
1951	7.515
1952	6.84
1953	7.758
1954	8.085
1955	8.488
1956	8.226
1957	9.514
1958	9.823
1959	10.93
1960	11.51
1961	11.91
1962	12.01
1963	13.14
1964	14.26
1965	14.5
1966	15.14
1967	15.26
1968	15.46
1969	17.05
1970	17.73
1971	19.6
1972	20.1
1973	20.59
1974	23.04
1975	22.84
1976	23.33
1977	24.79
1978	25.93
1979	27.48
1980	28.64
1981	28.97
1982	29
1983	29.08
1984	29.65
1985	29.74
1986	30.8
1987	30.31
1988	29.75
1989	29.25
1990	27.01
1991	21.17
1992	18.53
1993	16.89
1994	17.76
1995	18.94
1996	20.12
1997	21.66
1998	22.43
1999	22.43
2000	23.21
2001	24.28
2002	25.5
2003	26.49
2004	27.39
2005	29.02
2006	30.41
2007	32.1
2008	32.85
2009	30.94