Year	per 100,000 people
2000	6.6
2001	6.4
2002	6
2003	5.9
2004	5.7
2005	5.5
2006	5.3
2007	5.1
2008	4.9
2009	4.4
2010	4.2
2011	3.9
2012	3.8
2013	3.5
2014	3.4
2015	3.4
2016	3.3
2017	3.3
2018	3.2
2019	3.2
2020	2.7
2021	2.9
2022	2.9