Year	Percent
1980-01-01	6.919220000000000
1981-01-01	7.706239999999999
1982-01-01	8.407190000000000
1983-01-01	9.085220000000000
1984-01-01	9.579150000000000
1985-01-01	11.071700000000000
1986-01-01	11.811700000000000
1987-01-01	15.306400000000000
1988-01-01	14.406400000000000
1989-01-01	14.819100000000000
1990-01-01	17.926300000000000
1991-01-01	23.854800000000000
1992-01-01	36.174600000000000
1993-01-01	47.084100000000000
1994-01-01	50.758999999999990
1995-01-01	38.915700000000000
1996-01-01	38.780800000000000
1997-01-01	35.549600000000000
1998-01-01	32.048600000000000
1999-01-01	30.046200000000000
2000-01-01	27.888500000000000
2001-01-01	28.724100000000000
2002-01-01	30.160400000000000
2003-01-01	36.748100000000000
2004-01-01	36.544800000000000
2005-01-01	32.794100000000000
2006-01-01	33.369000000000000
2007-01-01	26.727100000000000
2008-01-01	21.984700000000000
2009-01-01	32.304500000000000
2010-01-01	35.485400000000000
2011-01-01	36.385700000000000
2012-01-01	46.266100000000000
2013-01-01	51.744900000000000
2014-01-01	50.092000000000000
2015-01-01	60.080200000000000
2016-01-01	60.137100000000000