Year	Percent
1980-01-01	1.40983000000000000
1981-01-01	1.39123000000000000
1982-01-01	1.29041000000000000
1983-01-01	1.19713999999999990
1984-01-01	1.04542000000000000
1985-01-01	1.27732999999999990
1986-01-01	0.99467199999999990
1987-01-01	0.89659000000000000
1988-01-01	0.54666100000000000
1989-01-01	0.37358600000000003
1990-01-01	1.81453000000000000
1991-01-01	1.65012000000000000
1992-01-01	6.99308000000000000
1993-01-01	7.01380000000000000
1994-01-01	6.05807000000000000
1995-01-01	5.17845000000000000
1996-01-01	5.60084000000000000
1997-01-01	5.53291000000000000
1998-01-01	7.43637000000000000
1999-01-01	9.98590000000000000
2000-01-01	11.31250000000000000
2001-01-01	13.07070000000000000
2002-01-01	15.65380000000000000
2003-01-01	18.78100000000000000
2004-01-01	19.02620000000000000
2005-01-01	18.94850000000000000
2006-01-01	17.81430000000000000
2007-01-01	14.98299999999999900
2008-01-01	12.76720000000000000
2009-01-01	14.56360000000000000
2010-01-01	13.24120000000000000
2011-01-01	12.17120000000000000
2012-01-01	11.75840000000000000
2013-01-01	10.09850000000000000
2014-01-01	9.64063000000000000
2015-01-01	9.78251000000000000
2016-01-01	9.35702000000000000