Year	Percent
1982-01-01	16.943300000000000
1983-01-01	17.739000000000000
1984-01-01	19.020300000000000
1985-01-01	20.571200000000000
1986-01-01	22.099000000000000
1987-01-01	37.366400000000000
1988-01-01	49.250700000000000
1989-01-01	46.322300000000000
1990-01-01	47.004900000000000
1991-01-01	44.667000000000000
1992-01-01	40.637800000000000
1993-01-01	39.912800000000000
1994-01-01	38.637300000000000
1995-01-01	34.799300000000000
1996-01-01	32.878200000000000
1997-01-01	32.279400000000000
1998-01-01	32.944700000000000
1999-01-01	33.922300000000000
2000-01-01	36.271500000000000
2001-01-01	39.853400000000000
2002-01-01	42.563400000000000
2003-01-01	48.179700000000000
2004-01-01	53.262400000000000
2005-01-01	57.351000000000006
2006-01-01	62.148000000000000
2007-01-01	69.700400000000000
2008-01-01	78.320800000000000
2009-01-01	82.647300000000000
2010-01-01	76.428300000000000
2011-01-01	75.072500000000000
2012-01-01	71.709200000000000
2013-01-01	63.708000000000000
2014-01-01	59.266100000000000
2015-01-01	56.612600000000000
2016-01-01	55.111000000000004