Year	per person
1500	1.091
1600	1.091
1700	1.091
1800	1.09
1820	1.09
1870	1.428
1913	1.801
1950	3.691
1951	3.698
1952	3.702
1953	3.724
1954	3.744
1955	3.762
1956	3.681
1957	3.601
1958	3.523
1959	3.445
1960	3.37
1961	3.402
1962	3.435
1963	3.468
1964	3.501
1965	3.535
1966	3.642
1967	3.752
1968	3.865
1969	3.981
1970	4.099
1971	4.221
1972	4.233
1973	4.297
1974	4.44
1975	4.644
1976	5.053
1977	5.199
1978	5.247
1979	5.382
1980	5.763
1981	5.502
1982	5.927
1983	5.739
1984	5.823
1985	6.028
1986	6.337
1987	6.042
1988	6.5
1989	6.492
1990	6.584
1991	6.882
1992	6.465
1993	6.266
1994	6.776
1995	6.203
1996	6.825
1997	6.54
1998	6.923
1999	6.792
2000	6.74
2001	7.042
2002	7.146
2003	7.457
2004	7.718
2005	7.779
2006	8.278
2007	8.406
2008	8.752
2009	9.129