Year	per person
1800	0.7895
1820	0.7895
1913	0.7776
1950	0.773
1951	0.7915
1952	0.8096
1953	0.8278
1954	0.8461
1955	0.8439
1956	0.8959
1957	0.9131
1958	0.9258
1959	0.9374
1960	0.9401
1961	0.964
1962	0.9384
1963	0.898
1964	0.8557
1965	0.9473
1966	1.016
1967	1.087
1968	1.045
1969	1.083
1970	1.072
1971	1.195
1972	1.282
1973	1.351
1974	1.401
1975	1.411
1976	1.425
1977	1.454
1978	1.543
1979	1.57
1980	1.535
1981	1.416
1982	1.388
1983	1.404
1984	1.423
1985	1.489
1986	1.44
1987	1.394
1988	1.34
1989	1.328
1990	1.322
1991	1.382
1992	1.235
1993	1.332
1994	1.218
1995	1.433
1996	1.502
1997	1.518
1998	1.527
1999	1.548
2000	1.565
2001	1.464
2002	1.459
2003	1.48
2004	1.517
2005	1.515
2006	1.687
2007	1.674
2008	1.795
2009	1.9