Year	per person
1800	0.8349
1820	0.8349
1913	1.29
1950	5.649
1951	5.822
1952	5.854
1953	5.933
1954	6.111
1955	6.147
1956	6.221
1957	6.283
1958	6.271
1959	6.447
1960	6.674
1961	6.718
1962	6.625
1963	6.683
1964	6.622
1965	6.609
1966	6.636
1967	6.623
1968	6.578
1969	6.563
1970	7.795
1971	8.069
1972	8.101
1973	8.232
1974	7.836
1975	7.781
1976	8.116
1977	6.758
1978	6.495
1979	6.357
1980	6.258
1981	6.305
1982	6.315
1983	6.188
1984	6.787
1985	6.624
1986	6.467
1987	6.316
1988	6.015
1989	5.659
1990	5.454
1991	5.348
1992	5.213
1993	4.894
1994	4.735
1995	4.5
1996	4.226
1997	4.156
1998	4.113
1999	4.169
2000	4.154
2001	4.165
2002	4.185
2003	4.236
2004	4.26
2005	4.307
2006	4.404
2007	4.515
2008	4.661
2009	4.774