Year	Percent
1980-01-01	3.132200000000000
1981-01-01	3.891190000000000
1982-01-01	5.138690000000000
1983-01-01	5.747070000000000
1984-01-01	6.292980000000000
1985-01-01	7.729920000000000
1986-01-01	9.529119999999999
1987-01-01	12.350200000000000
1988-01-01	13.366600000000000
1989-01-01	16.565600000000000
1990-01-01	17.511500000000000
1991-01-01	17.321300000000000
1992-01-01	18.751300000000000
1993-01-01	23.150000000000000
1994-01-01	23.261999999999997
1995-01-01	19.815100000000000
1996-01-01	18.946200000000000
1997-01-01	20.460100000000000
1998-01-01	21.310100000000000
1999-01-01	25.987800000000000
2000-01-01	30.360300000000000
2001-01-01	33.631200000000000
2002-01-01	36.005300000000000
2003-01-01	36.784700000000000
2004-01-01	38.399900000000000
2005-01-01	39.030900000000000
2006-01-01	43.449100000000000
2007-01-01	49.264700000000000
2008-01-01	51.608000000000004
2009-01-01	79.467700000000000
2010-01-01	71.186000000000000
2011-01-01	68.388200000000000
2012-01-01	80.414800000000000
2013-01-01	78.606800000000000
2014-01-01	72.487700000000000
2015-01-01	83.082000000000010
2016-01-01	77.950800000000000