Year	per 1,000 population at risk
2000	16.7220399735885
2001	6.59005379565868
2002	3.07780209808131
2003	1.53735263253061
2004	0.987395094342072
2005	1.16822709187158
2006	3.75461800026902
2007	0.990747400821738
2008	1.8462398548857
2009	2.00155471995901
2010	1.60737735004121
2011	0.482039096056538
2012	0.210779864698741
2013	0.493193923850858
2014	1.38464043390294
2015	0.297719923417275
2016	0.630929389768172
2017	1.83939546751354
2018	0.495928281140881
2019	0.155679401804916
2020	1.04489184717805
2021	0.61768970066524
2022	0.310809578669517