Year	% of people at risk
2003	1
2004	0.8
2005	1
2006	1
2007	0.8
2008	0.8
2009	0.8
2010	0.6
2011	0.7
2012	0.7
2013	0.7
2014	0.8
2015	0.7
2016	0.6
2017	0.6
2018	0.6
2019	0.6
2020	0.3
2021	0.3
2022	0.3