Year	per person
1800	1.89
1820	1.89
1870	2.096
1900	4.783
1901	5.268
1902	4.98
1903	4.284
1904	4.14
1905	4.583
1906	5.151
1907	4.697
1908	5.396
1909	5.455
1910	5.926
1911	5.308
1912	4.541
1913	3.929
1914	4.697
1915	4.79
1916	3.96
1917	5.488
1918	4.29
1919	4.867
1920	4.192
1921	4.734
1922	6.254
1923	6.404
1924	6.265
1925	7.059
1926	5.826
1927	4.309
1928	5.12
1929	7.209
1930	6.615
1931	4.872
1932	4.24
1933	5.998
1934	7.077
1935	7.972
1936	7.92
1937	8.603
1938	7.295
1939	8.485
1950	7.748
1951	7.306
1952	5.077
1953	6.059
1954	6.944
1955	6.387
1956	7.027
1957	6.235
1958	6.248
1959	7.024
1960	7.513
1961	8.296
1962	8.059
1963	8.569
1964	8.393
1965	9.169
1966	9.928
1967	10.92
1968	12.21
1969	13.68
1970	15.34
1971	16.9
1972	18.85
1973	20.6
1974	21.5
1975	21.85
1976	23.11
1977	24.58
1978	26.37
1979	28.52
1980	30.93
1981	32.42
1982	33.27
1983	35.67
1984	37.97
1985	37.36
1986	38.2
1987	41.36
1988	45.05
1989	48.22
1990	50.75
1991	52.6
1992	54.32
1993	59.3
1994	64.26
1995	67.53
1996	70.03
1997	73.51
1998	70
1999	74.52
2000	80.78
2001	76.56
2002	79
2003	81.19
2004	87.27
2005	90.96
2006	95.81
2007	99.46
2008	99.12
2009	95.45