Year	Percent
1980-01-01	1.465510000000000
1981-01-01	1.346600000000000
1982-01-01	3.401270000000000
1983-01-01	6.741460000000001
1984-01-01	8.802410000000000
1985-01-01	16.007700000000000
1986-01-01	19.430200000000000
1987-01-01	19.278200000000000
1988-01-01	16.581200000000000
1989-01-01	14.602300000000000
1990-01-01	13.511900000000000
1991-01-01	12.430500000000000
1992-01-01	8.272610000000000
1993-01-01	6.688780000000000
1994-01-01	6.376890000000000
1995-01-01	6.879770000000000
1996-01-01	8.381200000000000
1997-01-01	11.439000000000000
1998-01-01	15.287700000000000
1999-01-01	16.997000000000000
2000-01-01	15.498800000000000
2001-01-01	17.129500000000000
2002-01-01	20.981600000000000
2003-01-01	19.361900000000000
2004-01-01	20.922800000000000
2005-01-01	18.919600000000000
2006-01-01	18.531400000000000
2007-01-01	15.705900000000000
2008-01-01	13.523100000000000
2009-01-01	15.748700000000000
2010-01-01	15.471100000000000
2011-01-01	13.698900000000000
2012-01-01	15.971700000000000
2013-01-01	16.410000000000000
2014-01-01	16.126200000000000
2015-01-01	19.904000000000000
2016-01-01	21.213400000000000