Year	Percent
1983	0.00255
1985	3.30467
1986	9.90613
1987	5.60365
1988	5.90245
1989	15.5653
1990	15.84614
1991	39.04477
1992	22.4944
1993	30.69005
1994	19.61048
1995	24.73098
1996	22.76144
1997	22.43263
1998	20.89002
1999	22.51257
2000	22.80201
2001	13.83403
2002	21.68791
2003	15.5347
2004	13.91789
2005	7.95235
2006	8.4018
2007	10.38361
2008	8.68953
2009	14.18442
2010	9.61341
2011	10.07313
2012	7.24323
2013	7.37364
2014	5.23099
2015	4.11073
2016	7.20517
2017	8.3129
2018	7.81534
2019	7.50351
2020	12.22196
2021	8.3894