Year	per person
1800	1.09
1820	1.09
1870	1.162
1890	1.499
1913	1.607
1929	1.517
1938	1.58
1950	1.562
1951	1.623
1952	1.662
1953	1.788
1954	1.718
1955	1.807
1956	1.778
1957	1.74
1958	1.747
1959	1.897
1960	2.062
1961	2.103
1962	2.198
1963	2.304
1964	2.388
1965	2.501
1966	2.7
1967	2.841
1968	2.986
1969	3.128
1970	3.24
1971	3.298
1972	3.343
1973	3.583
1974	3.652
1975	3.745
1976	3.999
1977	4.301
1978	4.63
1979	4.773
1980	4.884
1981	5.074
1982	5.248
1983	5.445
1984	5.662
1985	5.832
1986	6.062
1987	6.541
1988	7.303
1989	8.079
1990	8.859
1991	9.491
1992	10.12
1993	10.83
1994	11.66
1995	12.58
1996	13.16
1997	12.83
1998	11.37
1999	11.77
2000	12.23
2001	12.4
2002	12.97
2003	13.76
2004	14.52
2005	15.06
2006	15.8
2007	16.46
2008	16.72
2009	16.18