Year	Percent
1980-01-01	7.487150000000000
1981-01-01	9.358789999999999
1982-01-01	10.162700000000000
1983-01-01	11.942600000000000
1984-01-01	16.777500000000000
1985-01-01	18.923400000000000
1986-01-01	21.676200000000000
1987-01-01	24.307900000000000
1988-01-01	22.978600000000000
1989-01-01	24.741000000000000
1990-01-01	22.576900000000000
1991-01-01	18.927400000000000
1992-01-01	15.007300000000000
1993-01-01	20.248600000000000
1994-01-01	18.383600000000000
1995-01-01	15.543500000000000
1996-01-01	14.777999999999999
1997-01-01	15.171500000000000
1998-01-01	14.303400000000000
1999-01-01	14.100100000000000
2000-01-01	15.174200000000000
2001-01-01	16.332300000000000
2002-01-01	16.270500000000000
2003-01-01	19.762200000000000
2004-01-01	20.282700000000000
2005-01-01	23.954100000000000
2006-01-01	29.340999999999998
2007-01-01	37.170200000000000
2008-01-01	39.475900000000000
2009-01-01	53.886500000000000
2010-01-01	48.810800000000000
2011-01-01	46.399900000000000
2012-01-01	52.010800000000000
2013-01-01	48.451300000000000
2014-01-01	41.911800000000000
2015-01-01	46.677400000000000
2016-01-01	45.317300000000000