Year	per 1,000 people
1980	3.623
1985	4.099
1986	4.077
1987	4.112
1988	4.183
1989	4.162
1990	3.51
1991	3.573
1992	3.076
1993	2.822
1994	2.797
1995	2.734
1996	2.749
1997	2.791
1998	2.681
1999	2.677
2000	2.85
2001	2.662
2002	2.77
2003	2.824
2004	2.917
2005	2.968
2006	3.049
2007	3.178
2008	3.274
2009	3.176
2010	3.101
2011	3.108
2012	3.115
2013	3.162
2014	3.189
2015	3.175
2016	3.19
2017	3.184
2018	3.289
2019	3.263
2020	3.345