Year	Percent
1983-01-01	38.69850000000000
1984-01-01	42.17320000000000
1985-01-01	48.93160000000000
1986-01-01	35.12350000000000
1987-01-01	44.71360000000000
1988-01-01	34.46090000000000
1989-01-01	36.67180000000000
1990-01-01	34.95890000000000
1991-01-01	29.58390000000000
1992-01-01	14.06030000000000
1993-01-01	19.53580000000000
1994-01-01	17.12450000000000
1995-01-01	18.49610000000000
1996-01-01	19.75420000000000
1997-01-01	31.04860000000000
1998-01-01	25.21360000000000
1999-01-01	30.33610000000000
2000-01-01	32.67620000000000
2001-01-01	24.76790000000000
2002-01-01	23.92580000000000
2003-01-01	22.01340000000000
2004-01-01	29.03930000000000
2005-01-01	31.44160000000000
2006-01-01	38.62170000000000
2007-01-01	44.25710000000000
2008-01-01	49.68590000000000
2009-01-01	61.24170000000000
2010-01-01	69.95550000000000
2011-01-01	55.90870000000000
2012-01-01	54.79600000000001
2013-01-01	50.06510000000000
2014-01-01	53.63220000000000
2015-01-01	90.43560000000000
2016-01-01	86.14900000000000