Year	per person
1800	1.159
1820	1.159
1870	1.411
1913	1.966
1950	3.269
1951	3.332
1952	3.392
1953	3.453
1954	3.512
1955	3.194
1956	4.205
1957	4.136
1958	4.364
1959	4.496
1960	4.58
1961	5.278
1962	5.149
1963	5.207
1964	5.859
1965	6.257
1966	6.167
1967	6.013
1968	5.255
1969	5.45
1970	4.708
1971	4.65
1972	4.629
1973	4.695
1974	4.926
1975	5.077
1976	6.086
1977	6.255
1978	7.308
1979	7.703
1980	8.806
1981	8.85
1982	9.126
1983	8.955
1984	9.369
1985	9.345
1986	9.832
1987	9.756
1988	9.336
1989	8.065
1990	7.454
1991	6.851
1992	7.525
1993	7.728
1994	7.918
1995	8.185
1996	8.045
1997	7.994
1998	7.949
1999	7.953
2000	8.036
2001	8.208
2002	8.432
2003	8.54
2004	9.025
2005	9.417
2006	9.937
2007	10.59
2008	11.15
2009	11.2