Year	Percent
1989-01-01	3.5774000000000000
1990-01-01	2.5429800000000000
1991-01-01	3.3513800000000002
1992-01-01	4.7467500000000000
1993-01-01	5.7292000000000000
1994-01-01	14.8467000000000000
1995-01-01	18.4166000000000000
1996-01-01	21.0421000000000000
1997-01-01	26.4687000000000000
1998-01-01	23.8182000000000000
1999-01-01	27.8750000000000000
2000-01-01	33.5340000000000000
2001-01-01	32.3789000000000000
2002-01-01	26.9828000000000000
2003-01-01	32.0176000000000000
2004-01-01	43.0129000000000000
2005-01-01	48.9940000000000000
2006-01-01	56.0539000000000000
2007-01-01	77.0538000000000000
2008-01-01	61.4317000000000000
2009-01-01	56.1026000000000000
2010-01-01	69.6023000000000000
2011-01-01	55.1997000000000000
2012-01-01	46.1488000000000000
2013-01-01	43.3083000000000000
2014-01-01	36.4523000000000000
2015-01-01	30.6343000000000000
2016-01-01	34.3462000000000000
2017-01-01	43.3807000000000000