Year	Percent
1986	56.48887
1987	66.50587
1988	62.58219
1989	86.90234
1990	54.37733
1991	68.78764
1992	77.59793
1993	70.45625
1994	56.7771
1995	51.67408
1996	37.06897
1997	47.97922
1998	52.16728
1999	34.61993
2000	25.01655
2001	62.04005
2002	59.26507
2003	33.64238
2004	36.46902
2005	33.62254
2006	16.70107
2007	17.51014
2008	19.236
2009	15.2088
2010	15.86295
2011	12.38441
2012	31.86659
2013	23.75713
2014	28.11457
2015	25.38383
2016	12.52486
2017	20.53931
2018	28.21812
2019	21.19391
2020	16.3421
2021	12.4226