Year	per person
1800	1.701
1820	1.701
1913	3.138
1970	6.181
1971	6.636
1972	6.98
1973	7.263
1974	7.662
1975	7.872
1976	8.38
1977	8.948
1978	9.663
1979	10.62
1980	11.55
1981	11.74
1982	11.61
1983	11.56
1984	12.83
1985	13.74
1986	15.48
1987	16.98
1988	18.67
1989	20.19
1990	20.66
1991	20.64
1992	21.12
1993	22.2
1994	23.03
1995	23.52
1996	24.73
1997	26.11
1998	26.01
1999	26.61
2000	27.39
2001	27.57
2002	27.51
2003	27.29
2004	29
2005	29.99
2006	31.02
2007	31.03
2008	31.83
2009	29.5