Year	per 1,000 people
1980	1.673
1981	1.738
1982	1.808
1983	1.858
1984	1.88
1990	2.91
1991	2.628
1992	2.68
1993	2.692
1994	2.649
1995	2.612
1996	2.62
1997	2.642
1998	2.504
1999	2.42
2000	2.295
2001	2.341
2002	2.362
2003	2.425
2004	2.497
2005	2.506
2006	2.547
2007	2.678
2008	2.686
2009	2.696
2010	2.816
2011	2.87
2012	2.949
2013	2.995
2014	3.105
2015	3.156
2016	3.197
2017	3.312
2018	3.383
2019	3.466