Year	Percent
1982	18.04442
1987	24.50855
1988	23.94609
1989	22.76023
1994	14.05993
1995	13.9092
1996	14.8758
1998	17.07084
1999	19.7239
2000	22.20844
2001	27.60311
2002	31.36929
2003	34.64683
2004	37.45125
2005	43.32684
2006	47.22712
2007	47.35952
2008	49.48462
2009	51.38162
2010	57.74343
2011	52.6144
2012	50.3893
2014	53.54442
2015	54.28185