Year	per 1,000 population at risk
2000	7.8456330010887205
2001	8.512304371500768
2002	9.168036712065755
2003	8.224899166593906
2004	6.452501984659801
2005	6.656686934475192
2006	7.75750730745698
2007	5.398622595812615
2008	3.339640025299908
2009	4.220097379464617
2010	6.611260703218426
2011	4.539120254226923
2012	4.604052698737802
2013	3.6910181420225205
2014	3.0990453801128828
2015	2.6792464814953783
2016	3.3994042396001225
2017	3.771130643909558
2018	4.35507117104724
2019	4.203450009318016
2020	4.098835449490404
2021	4.796027109071619
2022	4.224706872173051