Year	per person
1800	1.127
1820	1.138
1850	1.184
1870	1.217
1913	1.588
1950	1.545
1973	2.729
1990	4.951
1991	5.306
1992	5.653
1993	6.024
1994	6.46
1995	6.991
1996	7.779
1997	8.238
1998	8.224
1999	5.357
2000	6.016
2001	6.761
2002	5.978
2003	5.265
2004	4.974
2005	4.831
2006	4.427
2007	4.679
2008	5.16
2009	5.429