Year	per person
1800	0.9192
1820	0.9192
1870	0.919
1913	1.248
1950	1.149
1951	1.17
1952	1.197
1953	1.257
1954	1.27
1955	1.282
1956	1.325
1957	1.311
1958	1.37
1959	1.392
1960	1.405
1961	1.419
1962	1.431
1963	1.441
1964	1.45
1965	1.46
1966	1.535
1967	1.483
1968	1.466
1969	1.503
1970	1.513
1971	1.465
1972	1.48
1973	1.441
1974	1.498
1975	1.485
1976	1.514
1977	1.522
1978	1.55
1979	1.548
1980	1.474
1981	1.437
1982	1.575
1983	1.491
1984	1.594
1985	1.65
1986	1.678
1987	1.701
1988	1.789
1989	1.785
1990	1.87
1991	1.939
1992	1.969
1993	1.994
1994	2.104
1995	2.124
1996	2.183
1997	2.217
1998	2.205
1999	2.224
2000	2.313
2001	2.38
2002	2.318
2003	2.336
2004	2.367
2005	2.371
2006	2.427
2007	2.484
2008	2.591
2009	2.686