Year	per 1,000 adults
2004	0.02
2005	0.05
2006	0.13
2007	0.29
2008	0.51
2009	0.67
2010	1.1
2011	1.46
2012	3.48
2013	3.26
2014	4.76
2015	9.42
2016	9.94
2017	9.72
2018	9.74