Year	per person
1800	1.318
1820	1.346
1870	1.497
1890	2.006
1900	2.299
1910	2.619
1913	2.721
1929	3.109
1950	3.36
1951	3.505
1952	3.511
1953	3.653
1954	3.76
1955	3.963
1956	4.003
1957	4.259
1958	4.451
1959	4.635
1960	4.869
1961	4.91
1962	5.072
1963	5.245
1964	5.425
1965	5.623
1966	5.833
1967	6.053
1968	6.272
1969	6.485
1970	6.724
1971	6.992
1972	7.266
1973	7.628
1974	7.657
1975	7.683
1976	7.714
1977	7.748
1978	7.783
1979	7.821
1980	7.877
1981	7.919
1982	7.962
1983	8.009
1984	8.055
1985	8.097
1986	8.148
1987	8.199
1988	8.251
1989	8.314
1990	8.388
1991	5.96
1992	5.477
1993	5.958
1994	6.401
1995	7.205
1996	7.828
1997	7.002
1998	7.861
1999	8.615
2000	9.2
2001	9.816
2002	10.1
2003	10.65
2004	11.22
2005	11.77
2006	12.36
2007	13.09
2008	14.03
2009	14.36