Year	Percent
1980-01-01	2.2278000000000000
1981-01-01	2.6553800000000000
1982-01-01	3.4080600000000000
1983-01-01	3.2886300000000004
1984-01-01	4.5042800000000005
1985-01-01	4.6344400000000010
1986-01-01	4.4396000000000000
1987-01-01	3.7535000000000000
1988-01-01	4.0703900000000000
1989-01-01	4.0047600000000000
1990-01-01	3.0940300000000000
1991-01-01	3.5488900000000000
1992-01-01	3.0952200000000000
1993-01-01	2.6984200000000000
1994-01-01	2.1268000000000000
1995-01-01	2.3424400000000003
1996-01-01	2.3722600000000000
1997-01-01	2.6237500000000000
1998-01-01	2.2235099999999997
1999-01-01	21.5704000000000000
2000-01-01	29.7638000000000000
2001-01-01	24.2897000000000000
2002-01-01	20.6711000000000000
2003-01-01	17.1324000000000000
2004-01-01	13.5878000000000000
2005-01-01	11.2252000000000000
2006-01-01	9.3505100000000000
2007-01-01	8.3264300000000000
2008-01-01	6.6001600000000010
2009-01-01	6.1777500000000000
2010-01-01	4.9724900000000005
2011-01-01	4.3471400000000004
2012-01-01	4.8767900000000000
2013-01-01	5.4309100000000000
2014-01-01	5.3942500000000000
2015-01-01	6.0458900000000000
2016-01-01	6.7594899999999996