Year	Percent
1973	11.75382
1982	47.83226
1983	36.71874
1984	42.78287
1985	42.39601
1986	53.55217
1987	40.82782
1988	33.40288
1989	32.31637
1990	33.23478
1991	33.24034
1992	30.67282
1993	30.44596
1994	31.34349
1995	31.93957
1999	17.26554
2000	20.02914
2001	23.61355
2002	27.36742
2004	34.74998
2005	47.84686
2006	46.96744
2007	50.63685
2008	63.42803
2009	59.43731
2010	62.19234
2011	57.98272
2012	54.85989
2013	52.15815
2014	51.12324
2015	51.25031