Year	Percent
1983-01-01	63.3371
1984-01-01	68.9398
1985-01-01	90.9116
1986-01-01	85.9607
1987-01-01	68.2122
1988-01-01	52.0030
1989-01-01	39.5578
1990-01-01	35.6642
1991-01-01	31.2985
1992-01-01	30.9666
1993-01-01	29.5653
1994-01-01	33.2078
1995-01-01	29.1594
1996-01-01	34.2637
1997-01-01	39.3438
1998-01-01	47.4554
1999-01-01	57.3086
2000-01-01	63.2453
2001-01-01	60.8279
2002-01-01	61.1853
2003-01-01	63.5425
2004-01-01	51.6933
2005-01-01	46.4507
2006-01-01	41.4389
2007-01-01	46.3227
2008-01-01	46.7111
2009-01-01	60.6576
2010-01-01	53.7427
2011-01-01	50.4043
2012-01-01	53.3457
2013-01-01	49.1411
2014-01-01	49.2987
2015-01-01	50.7035
2016-01-01	60.4412