Year	per 1,000 people
1990	4.695
1991	4.874
1992	5.017
1995	3.797
1996	3.896
1997	3.994
1998	4.069
1999	4.115
2000	3.442
2001	3.506
2002	3.563
2003	3.624
2004	3.687
2005	3.707
2006	3.706
2007	3.773
2008	3.761
2009	3.761
2010	3.784
2011	3.856
2012	3.832
2013	3.895
2014	3.91
2015	3.87
2016	3.986
2017	4.025
2018	4.013
2019	4.051
2020	3.997
2021	4.126