Year	per person
1800	1.035
1820	1.035
1913	1.4
1960	4.466
1961	4.468
1962	4.472
1963	4.598
1964	4.671
1965	4.414
1966	4.3
1967	4.759
1968	5.023
1969	5.045
1970	5.568
1971	5.828
1972	6.135
1973	6.709
1974	6.747
1975	6.652
1976	6.709
1977	6.979
1978	6.982
1979	7.684
1980	7.4
1981	7.681
1982	7.038
1983	6.592
1984	6.994
1985	6.569
1986	7.013
1987	6.524
1988	6.579
1989	7.056
1992	7.479
1993	7.57
1994	7.85
1995	7.95
1996	8.246
1997	7.99
1998	8.027
1999	8.667
2000	8.457
2001	8.566
2002	8.782
2003	8.814
2004	9.224
2005	9.23
2006	9.319
2007	9.194
2008	9.108
2009	8.807