Year	Percent
1982-01-01	15.343900000000000
1983-01-01	16.191400000000000
1984-01-01	17.536800000000000
1985-01-01	19.088600000000000
1986-01-01	20.651200000000000
1987-01-01	35.716900000000000
1988-01-01	47.352800000000000
1989-01-01	44.356700000000000
1990-01-01	45.151500000000000
1991-01-01	40.860600000000000
1992-01-01	33.334100000000000
1993-01-01	27.758500000000000
1994-01-01	23.943600000000000
1995-01-01	21.545700000000000
1996-01-01	20.127900000000000
1997-01-01	20.725100000000000
1998-01-01	22.110800000000000
1999-01-01	23.553100000000000
2000-01-01	27.140100000000000
2001-01-01	30.559500000000000
2002-01-01	31.901600000000000
2003-01-01	36.658600000000000
2004-01-01	42.095700000000000
2005-01-01	46.406200000000000
2006-01-01	50.275300000000000
2007-01-01	56.454300000000000
2008-01-01	63.709400000000000
2009-01-01	66.049700000000000
2010-01-01	60.086700000000000
2011-01-01	58.983300000000000
2012-01-01	55.252600000000000
2013-01-01	47.558900000000000
2014-01-01	43.239000000000000
2015-01-01	38.530500000000000
2016-01-01	34.321999999999996