Year	Percent
1983-01-01	4.2526699999999990
1984-01-01	7.4989300000000005
1985-01-01	5.5194700000000000
1986-01-01	7.9842200000000000
1987-01-01	12.7704000000000000
1988-01-01	17.4566000000000000
1989-01-01	22.2066000000000000
1990-01-01	23.7034000000000000
1991-01-01	34.3724000000000000
1992-01-01	34.5265000000000000
1993-01-01	49.8994000000000000
1994-01-01	53.7929000000000000
1995-01-01	50.4203000000000000
1996-01-01	57.3826000000000000
1997-01-01	69.0253000000000000
1998-01-01	77.1948000000000000
1999-01-01	159.1110000000000000
2000-01-01	201.5640000000000200
2001-01-01	196.2650000000000000
2002-01-01	209.1420000000000000
2003-01-01	220.2809999999999800
2004-01-01	226.3380000000000000
2005-01-01	205.3120000000000000
2006-01-01	231.0810000000000000
2007-01-01	204.4420000000000000
2008-01-01	203.4100000000000000
2009-01-01	222.5920000000000000
2010-01-01	220.5810000000000000
2011-01-01	242.7890000000000200
2012-01-01	308.5350000000000000
2013-01-01	246.1520000000000200
2014-01-01	195.6509999999999800
2015-01-01	177.0740000000000000
2016-01-01	148.8100000000000000