Year	per 1,000 population at risk
2000	9.09897521980201
2001	5.31968071637931
2002	2.81929164382095
2003	2.43559668529111
2004	1.57950204305156
2005	0.997695233272293
2006	0.570173559304202
2007	0.26448172826939
2008	0.129985591219841
2009	0.065744348291108
2010	0.0439962068984481
2011	0.0299985116123085
2012	0.0105364918223653
2013	0.00147187233568109
2014	0.000719165767709457
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2022	0