Year	per person
1800	2.439
1820	2.491
1870	2.401
1890	3.379
1900	3.616
1910	4.237
1913	4.237
1920	4.134
1921	4.175
1922	4.236
1923	4.394
1924	4.643
1925	4.802
1926	5.064
1927	4.912
1928	5.268
1929	5.469
1930	5.285
1931	5.054
1932	4.521
1933	4.597
1934	4.703
1935	4.569
1936	5.091
1937	5.105
1938	5.438
1939	5.659
1947	5.273
1948	6.207
1949	6.728
1950	6.217
1951	6.378
1952	5.806
1953	6.585
1954	6.863
1955	7.205
1956	6.982
1957	8.075
1958	8.338
1959	9.275
1960	9.769
1961	10.11
1962	10.2
1963	11.15
1964	12.1
1965	12.31
1966	12.85
1967	12.96
1968	13.12
1969	14.47
1970	15.05
1971	16.64
1972	17.06
1973	17.48
1974	19.56
1975	19.39
1976	19.8
1977	21.04
1978	22.01
1979	23.32
1980	24.31
1981	24.59
1982	24.61
1983	24.68
1984	25.17
1985	25.24
1986	26.14
1987	25.73
1988	25.26
1989	24.83
1990	22.93
1991	20.28
1992	15.36
1993	9.635
1994	9.645
1995	10.85
1996	13.58
1997	14.18
1998	14.56
1999	13.19
2000	13.57
2001	13.84
2002	14.38
2003	15.11
2004	16.17
2005	17.18
2006	22.62
2007	25.06
2008	26.88