Year	Percent
1980-01-01	11.52430000000000000
1981-01-01	1.84772000000000000
1982-01-01	0.87936800000000000
1983-01-01	22.36140000000000000
1984-01-01	23.53590000000000000
1985-01-01	16.71430000000000000
1986-01-01	11.51310000000000000
1987-01-01	16.80800000000000000
1988-01-01	33.52730000000000000
1989-01-01	15.33150000000000000
1990-01-01	20.04520000000000000
1991-01-01	4.63258000000000000
1992-01-01	0.11504600000000001
1993-01-01	0.08303200000000001
1994-01-01	0.17950300000000000
1995-01-01	0.03207400000000000
1996-01-01	1.57464000000000000
1997-01-01	0.92731900000000000
1998-01-01	0.75225800000000000
1999-01-01	2.34275000000000000
2000-01-01	2.57206000000000000
2001-01-01	2.48219000000000000
2002-01-01	3.30390999999999970
2003-01-01	4.59174000000000000
2004-01-01	5.69062000000000000
2005-01-01	5.53866000000000000
2006-01-01	4.81808000000000000
2007-01-01	4.39624000000000000
2008-01-01	2.89608000000000000
2009-01-01	2.89331000000000000
2010-01-01	3.80118000000000040
2011-01-01	3.78666000000000000
2012-01-01	3.00129000000000000
2013-01-01	3.39316999999999960
2014-01-01	2.81095000000000000
2015-01-01	2.60364000000000000
2016-01-01	3.08684000000000000