Year	Percent
1983-01-01	30.46840
1984-01-01	28.01250
1985-01-01	32.32070
1986-01-01	21.50420
1987-01-01	11.78420
1988-01-01	12.67560
1989-01-01	9.51109
1990-01-01	10.46750
1991-01-01	8.55285
1992-01-01	7.31240
1993-01-01	7.59362
1994-01-01	7.04254
1995-01-01	11.78940
1996-01-01	16.24530
1997-01-01	18.86320
1998-01-01	21.17450
1999-01-01	24.09120
2000-01-01	31.94620
2001-01-01	28.42220
2002-01-01	23.89300
2003-01-01	22.31420
2004-01-01	20.09970
2005-01-01	19.59920
2006-01-01	17.95340
2007-01-01	24.71180
2008-01-01	26.06520
2009-01-01	25.89810
2010-01-01	28.56790
2011-01-01	27.96320
2012-01-01	31.50500
2013-01-01	29.68250
2014-01-01	30.44270
2015-01-01	34.10040
2016-01-01	33.53020