Year	per 1,000 people
1980	2.816
1981	2.895
1982	3.007
1983	3.089
1984	3.193
1985	3.297
1986	3.37
1987	3.444
1990	3.456
1991	3.383
1992	3.397
1993	3.44
1994	3.457
1995	3.417
1996	3.478
1997	3.514
1998	3.583
2000	2.427
2001	2.285
2002	2.327
2003	2.327
2004	2.247
2005	2.472
2006	2.5
2007	2.543
2008	2.54
2009	2.613
2010	2.645
2011	2.739
2012	2.805
2013	2.985
2014	3.02
2015	3.085
2017	4.093
2019	3.327
2020	4.057