Year	Percent
1980-01-01	1.1162800000000000
1981-01-01	1.2890300000000000
1982-01-01	1.3386900000000000
1983-01-01	1.9197099999999998
1984-01-01	2.0918799999999997
1985-01-01	1.6215700000000002
1986-01-01	1.6215700000000002
1987-01-01	1.3056200000000000
1988-01-01	1.1250000000000000
1989-01-01	1.1250000000000000
1990-01-01	3.2579700000000003
1991-01-01	3.9912199999999998
1992-01-01	3.8730700000000000
1993-01-01	3.5719000000000000
1994-01-01	3.9753300000000005
1995-01-01	4.0806300000000000
1996-01-01	4.1183300000000000
1997-01-01	5.1489900000000000
1998-01-01	5.8612600000000000
1999-01-01	5.4725199999999990
2000-01-01	6.3492300000000000
2001-01-01	10.5327000000000000
2002-01-01	6.1477800000000000
2003-01-01	9.0667000000000000
2004-01-01	10.1535000000000000
2005-01-01	10.7589000000000000
2006-01-01	7.3073500000000000
2007-01-01	6.1771300000000000
2008-01-01	5.8845100000000000
2009-01-01	8.1650400000000000
2010-01-01	8.4992800000000000
2011-01-01	7.9491700000000000
2012-01-01	8.2626900000000000
2013-01-01	8.5604600000000000
2014-01-01	8.6310800000000000
2015-01-01	7.5067100000000010
2016-01-01	6.9486800000000000