Year	Percent
2002	57.7
2003	51.4
2004	48.8
2005	44.9
2006	48.9
2007	45.3
2008	43.2
2009	41.6
2010	39
2011	37
2012	31.4
2013	28
2014	27.2
2015	26.6
2016	28.9
2017	26.4
2018	24.2
2019	23.5
2020	26.9
2021	26.9
2022	24.7