Year	Percent
1980-01-01	2.0253600000000000
1981-01-01	3.4713100000000000
1982-01-01	2.9430300000000000
1983-01-01	1.5968100000000000
1984-01-01	1.1439300000000000
1985-01-01	1.7053599999999998
1986-01-01	3.0822800000000000
1987-01-01	2.0913800000000000
1988-01-01	0.9045709999999999
1989-01-01	0.5673850000000000
1990-01-01	0.8095660000000000
1991-01-01	1.1299500000000000
1992-01-01	1.0691100000000000
1993-01-01	1.1787700000000000
1994-01-01	1.8247900000000001
1995-01-01	1.7628200000000000
1996-01-01	2.1151000000000000
1997-01-01	3.5407500000000000
1998-01-01	3.3405800000000000
1999-01-01	4.0836000000000000
2000-01-01	5.2963200000000000
2001-01-01	5.6146600000000000
2002-01-01	7.4936100000000000
2003-01-01	6.7987199999999990
2004-01-01	6.4150300000000010
2005-01-01	5.7947300000000000
2006-01-01	5.2682400000000005
2007-01-01	6.1175400000000000
2008-01-01	5.2230300000000005
2009-01-01	5.0160500000000000
2010-01-01	5.8223800000000000
2011-01-01	4.0092300000000005
2012-01-01	5.0621800000000010
2013-01-01	5.5476300000000010
2014-01-01	6.2449900000000005
2015-01-01	5.0644200000000000
2016-01-01	5.9771199999999990