Year	per person
1800	2.041
1820	2.041
1950	3.069
1970	6.843
1971	7.107
1972	7.218
1973	7.256
1974	7.593
1975	7.836
1976	9.179
1977	9.885
1978	10.47
1979	10.59
1980	9.85
1981	9.963
1982	10.12
1983	10.55
1984	11.12
1985	11.77
1986	13.52
1987	13.65
1988	15.32
1989	16.18
1990	16.4
1991	16.26
1992	17.23
1993	17.07
1994	17.2
1995	17.22
1996	18.24
1997	18.03
1998	19.01
1999	19.28
2000	19.03
2001	17.82
2002	18.13
2003	18.71
2004	19.47
2005	20.35
2006	21.06
2007	21.18
2008	21.13
2009	19.85