Year	Percent
1985-01-01	21.8395000000000000
1986-01-01	23.5357000000000000
1987-01-01	21.5340000000000020
1988-01-01	20.1498000000000000
1989-01-01	25.8991000000000000
1990-01-01	25.8023000000000000
1991-01-01	28.9670000000000000
1992-01-01	25.4751000000000000
1993-01-01	13.6038000000000000
1994-01-01	4.5364400000000000
1995-01-01	4.5134300000000005
1996-01-01	4.2553300000000010
1997-01-01	3.6249500000000000
1998-01-01	6.0363100000000000
1999-01-01	4.1479700000000000
2000-01-01	3.1120400000000004
2001-01-01	2.7048900000000002
2002-01-01	3.2844200000000000
2003-01-01	2.5808000000000000
2004-01-01	1.9303099999999997
2005-01-01	1.9358799999999998
2006-01-01	2.2198400000000000
2007-01-01	2.5639500000000000
2008-01-01	3.2787200000000000
2009-01-01	5.7149900000000000
2010-01-01	6.1897000000000000
2011-01-01	6.5126300000000010
2012-01-01	6.0121900000000000
2013-01-01	6.7263800000000010
2014-01-01	8.6466700000000000
2015-01-01	14.8261000000000000
2016-01-01	19.6550000000000000