Year	% of people at risk
2003	0.5
2004	0.4
2005	0.4
2006	0.5
2007	0.4
2008	0.4
2009	0.4
2010	0.3
2011	0.2
2012	0.3
2013	0.3
2014	0.2
2015	0.2
2016	0.2
2017	0.2
2018	0.2
2019	0.1
2020	0.2
2021	0.2
2022	0.1