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