Year	Percent
1990	27.50161
1991	25.55719
1992	27.84554
1993	23.6848
1994	19.91674
1995	16.7658
1996	14.93711
2006	26.93256
2007	25.71282
2008	27.3742
2009	27.28605
2010	23.60443
2011	23.168
2012	26.62445
2013	25.60989
2014	25.79128
2015	24.68758
2016	20.84763