Year	per person
1800	0.9349
1820	0.9349
1913	1.526
1950	2.684
1951	2.919
1952	3.065
1953	2.935
1954	3.007
1955	3.092
1956	3.293
1957	3.387
1958	3.45
1959	3.356
1960	3.405
1961	3.22
1962	3.645
1963	3.757
1964	3.88
1965	3.291
1966	3.618
1967	3.627
1968	3.526
1969	3.798
1970	4.082
1971	4.391
1972	4.802
1973	5.242
1974	5.403
1975	5.52
1976	5.747
1977	5.882
1978	5.876
1979	5.985
1980	6.2
1981	6.307
1982	6.274
1983	6.406
1984	6.283
1985	5.993
1986	6.041
1987	6.359
1988	6.27
1989	6.925
1990	6.465
1991	6.392
1992	6.676
1993	6.694
1994	6.868
1995	7.058
1996	7.44
1997	7.926
1998	8.367
1999	8.893
2000	9.54
2001	9.732
2002	10.01
2003	10.13
2004	10.61
2005	11.34
2006	12.38
2007	13.23
2008	13.73
2009	14.01