Year	Percent
1980-01-01	4.1935500000000000
1981-01-01	4.6966900000000000
1982-01-01	3.2437800000000000
1983-01-01	2.2010400000000003
1984-01-01	1.8645100000000000
1985-01-01	2.7170900000000002
1986-01-01	1.9038099999999998
1987-01-01	2.5737900000000002
1988-01-01	3.6572300000000000
1989-01-01	3.5872599999999997
1990-01-01	2.6177000000000000
1991-01-01	9.2049100000000000
1992-01-01	10.4719000000000000
1993-01-01	12.3752000000000000
1994-01-01	12.1733000000000000
1995-01-01	11.6538000000000000
1996-01-01	11.7292000000000000
1997-01-01	10.2083000000000000
1998-01-01	9.9832300000000000
1999-01-01	10.0654000000000000
2000-01-01	8.0523400000000000
2001-01-01	13.1614000000000000
2002-01-01	25.4948000000000000
2003-01-01	27.4936000000000000
2004-01-01	12.2620000000000000
2005-01-01	11.4883000000000000
2006-01-01	11.6649000000000000
2007-01-01	10.5534000000000000
2008-01-01	13.6089000000000000
2009-01-01	14.4755000000000000
2010-01-01	14.4845000000000000
2011-01-01	13.8970000000000000
2012-01-01	13.0765000000000000
2013-01-01	14.1339000000000000
2014-01-01	16.1465000000000000
2015-01-01	16.2738000000000000
2016-01-01	19.5342000000000000