Year	Percent
1983-01-01	17.4163
1984-01-01	20.9979
1985-01-01	19.8254
1986-01-01	18.6034
1987-01-01	24.2592
1988-01-01	34.9027
1989-01-01	48.4439
1990-01-01	55.2873
1991-01-01	47.5087
1992-01-01	29.3378
1993-01-01	25.1685
1994-01-01	19.5445
1995-01-01	17.7075
1996-01-01	14.5634
1997-01-01	15.3321
1998-01-01	12.0698
1999-01-01	17.8793
2000-01-01	19.8333
2001-01-01	13.6373
2002-01-01	16.7181
2003-01-01	15.9087
2004-01-01	14.5907
2005-01-01	13.6075
2006-01-01	13.8607
2007-01-01	15.2829
2008-01-01	14.6908
2009-01-01	16.5407
2010-01-01	15.0272
2011-01-01	13.9250
2012-01-01	13.5249
2013-01-01	14.1807
2014-01-01	11.5049
2015-01-01	10.6612
2016-01-01	11.7429