Year	Percent
1980-01-01	6.3512699999999995
1981-01-01	8.5177000000000000
1982-01-01	9.1061400000000000
1983-01-01	8.5315000000000000
1984-01-01	9.3542300000000010
1985-01-01	11.7635000000000000
1986-01-01	10.7250000000000000
1987-01-01	11.2219000000000000
1988-01-01	10.4829999999999990
1989-01-01	11.2053000000000000
1990-01-01	11.0134000000000000
1991-01-01	11.6401000000000000
1992-01-01	10.6132000000000000
1993-01-01	11.0576000000000000
1994-01-01	11.4316000000000000
1995-01-01	11.5704000000000000
1996-01-01	11.8301000000000000
1997-01-01	13.5307000000000000
1998-01-01	15.7317000000000000
1999-01-01	16.9402000000000000
2000-01-01	23.3754000000000000
2001-01-01	27.5251000000000000
2002-01-01	33.6513000000000000
2003-01-01	37.1287000000000000
2004-01-01	40.4593000000000000
2005-01-01	42.3929000000000000
2006-01-01	53.2103000000000000
2007-01-01	60.3007000000000000
2008-01-01	56.1436000000000000
2009-01-01	62.7887000000000000
2010-01-01	60.0541000000000000
2011-01-01	51.6179000000000000
2012-01-01	52.2540000000000000
2013-01-01	49.4178000000000000
2014-01-01	39.1311000000000000
2015-01-01	39.3506000000000000
2016-01-01	34.3256000000000000