Year	per person
1800	2.311
1820	2.425
1870	2.153
1890	3.23
1895	3.616
1896	3.674
1897	3.866
1898	4.031
1899	3.775
1900	3.748
1901	4.03
1902	3.699
1903	4.073
1904	4.1
1905	4.481
1906	4.382
1907	4.592
1908	4.535
1909	4.619
1910	4.61
1911	4.425
1912	4.388
1913	4.123
1914	4.131
1915	4.07
1916	4.384
1917	4.572
1918	4.75
1919	4.939
1920	5.253
1921	5.234
1922	5.272
1923	5.368
1924	5.195
1925	5.433
1926	5.672
1927	5.331
1928	5.278
1929	4.989
1930	4.596
1931	4.668
1932	3.891
1933	4.263
1934	4.477
1935	4.732
1936	5.028
1937	5.107
1938	5.102
1939	5.288
1940	5.27
1941	5.637
1942	5.799
1943	5.853
1944	6.17
1945	6.194
1946	6.43
1947	6.475
1948	6.563
1949	6.742
1950	7.223
1951	7.559
1952	7.627
1953	7.414
1954	7.927
1955	8.356
1956	8.67
1957	9.06
1958	9.264
1959	9.255
1960	9.722
1961	9.895
1962	10.05
1963	10.53
1964	11.43
1965	11.81
1966	12.25
1967	12.62
1968	13.24
1969	13.65
1970	14.15
1971	14.23
1972	14.93
1973	15.64
1974	16.06
1975	16.49
1976	16.73
1977	16.83
1978	17.89
1979	19.16
1980	20.44
1981	21.69
1982	21.08
1983	19.88
1984	20.13
1985	20.14
1986	19.11
1987	19.05
1988	18.92
1989	19.33
1990	19.96
1991	20.43
1992	20.77
1993	20.79
1994	21.35
1995	19.64
1996	20.34
1997	21.42
1998	22.17
1999	22.72
2000	23.89
2001	23.6
2002	23.56
2003	23.64
2004	24.38
2005	24.82
2006	25.82
2007	26.44
2008	26.61
2009	24.67