Year	Percent
1980-01-01	1.9291400000000000
1981-01-01	2.8192700000000000
1982-01-01	2.3716800000000000
1983-01-01	2.0819500000000000
1984-01-01	2.0624000000000000
1985-01-01	0.9564459999999999
1986-01-01	0.9674070000000000
1987-01-01	0.7841650000000000
1988-01-01	0.8822059999999999
1989-01-01	1.7610400000000002
1990-01-01	2.3330900000000003
1991-01-01	1.7195500000000000
1992-01-01	1.5744700000000000
1993-01-01	1.4927300000000000
1994-01-01	3.3569500000000000
1995-01-01	2.2986700000000000
1996-01-01	1.9711000000000000
1997-01-01	1.9672700000000000
1998-01-01	1.9765400000000002
1999-01-01	1.4047700000000000
2000-01-01	1.1410100000000000
2001-01-01	2.7500700000000000
2002-01-01	2.4915900000000000
2003-01-01	3.4711700000000000
2004-01-01	2.6354400000000000
2005-01-01	3.1369300000000000
2006-01-01	2.9513800000000000
2007-01-01	3.0973000000000000
2008-01-01	3.6624100000000000
2009-01-01	2.1363600000000000
2010-01-01	3.9850800000000004
2011-01-01	5.0648400000000000
2012-01-01	5.5515099999999995
2013-01-01	5.6050500000000000
2014-01-01	7.5904899999999990
2015-01-01	7.8472200000000000
2016-01-01	7.0218000000000000