Year	Percent
1980-01-01	11.56020
1981-01-01	7.70610
1982-01-01	10.50130
1983-01-01	9.61771
1984-01-01	10.55520
1985-01-01	10.71070
1986-01-01	15.22920
1987-01-01	15.91260
1988-01-01	18.55790
1989-01-01	18.14520
1990-01-01	19.89010
1991-01-01	9.39691
1992-01-01	13.11550
1993-01-01	14.42730
1994-01-01	15.84710
1995-01-01	20.42410
1996-01-01	18.86880
1997-01-01	20.50770
1998-01-01	14.28130
1999-01-01	15.67520
2000-01-01	13.95150
2001-01-01	15.28010
2002-01-01	20.70920
2003-01-01	26.38330
2004-01-01	27.12790
2005-01-01	28.49720
2006-01-01	24.74500
2007-01-01	22.53090
2008-01-01	22.54320
2009-01-01	25.63520
2010-01-01	22.37380
2011-01-01	18.06620
2012-01-01	18.68650
2013-01-01	18.21770
2014-01-01	21.00380
2015-01-01	20.67360
2016-01-01	24.18440