Year	per 1,000 population at risk
2000	8.10077663409015
2001	5.53321503942547
2002	2.62258644148776
2003	2.46617993865377
2004	1.96147181527611
2005	1.21551234850045
2006	0.699553972325446
2007	0.528885471809915
2008	0.347837849589117
2009	0.37186950241
2010	0.235343955190511
2011	0.0185824386663384
2012	0.0137508708884896
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2022	0