Year	per person
1800	0.7584
1820	0.7584
1913	1.172
1950	2.241
1951	2.296
1952	2.349
1953	2.402
1954	2.455
1955	2.508
1956	2.56
1957	2.612
1958	2.663
1959	2.713
1960	2.687
1961	2.738
1962	2.616
1963	2.559
1964	2.549
1965	2.515
1966	2.448
1967	2.491
1968	2.461
1969	2.532
1970	2.586
1971	2.451
1972	2.347
1973	2.405
1974	2.287
1975	2.27
1976	2.308
1977	2.433
1978	2.412
1979	2.218
1980	2.14
1981	2.116
1982	2.098
1983	1.92
1984	1.993
1985	1.955
1986	1.946
1987	1.853
1988	1.837
1989	1.853
1990	1.867
1991	1.803
1992	1.64
1993	1.596
1994	1.653
1995	1.702
1996	1.541
1997	1.624
1998	1.65
1999	1.675
2000	1.671
2001	1.652
2002	1.62
2003	1.473
2004	1.472
2005	1.48
2006	1.506
2007	1.531
2008	1.531
2009	1.527