Year	Percent
1995	19.34561
1996	18.6726
1997	22.25833
1998	23.63521
1999	22.67019
2000	20.77011
2001	20.69071
2002	19.98483
2003	20.24453
2004	20.41818
2005	21.54094
2006	22.24857
2007	21.71421
2008	20.82915
2009	18.83515
2010	19.81146
2011	20.04159
2012	21.10078
2013	21.97728
2014	22.41082
2015	22.76692
2016	23.88407