Year	Percent
1970-01-01	1.84277999999999990
1971-01-01	1.56930000000000000
1972-01-01	1.32685000000000000
1973-01-01	1.68210999999999980
1974-01-01	2.01655000000000000
1975-01-01	3.30886999999999980
1976-01-01	3.00794000000000000
1977-01-01	2.87196000000000000
1978-01-01	2.36417000000000000
1979-01-01	2.30679000000000030
1980-01-01	2.26150000000000000
1981-01-01	2.71548000000000000
1982-01-01	2.89773000000000000
1983-01-01	2.76546000000000000
1984-01-01	4.56068000000000050
1985-01-01	5.82116999999999950
1986-01-01	5.25444000000000000
1987-01-01	4.57605000000000000
1988-01-01	4.43453000000000050
1989-01-01	4.52454000000000000
1990-01-01	4.74830000000000000
1991-01-01	4.57730000000000000
1992-01-01	4.39458000000000000
1993-01-01	3.78870000000000000
1994-01-01	2.99819000000000000
1995-01-01	2.51968000000000000
1996-01-01	2.16260000000000000
1997-01-01	1.86313000000000000
1998-01-01	1.55120000000000000
1999-01-01	1.34550000000000000
2000-01-01	1.07447999999999990
2001-01-01	0.88151000000000000
2002-01-01	0.57138200000000000
2003-01-01	0.64217300000000000
2004-01-01	0.53292600000000000
2005-01-01	0.10758200000000000
2006-01-01	0.10739900000000000
2007-01-01	0.20056400000000002
2008-01-01	0.33022900000000000
2009-01-01	0.29393400000000003
2010-01-01	0.19892000000000000
2011-01-01	0.83352000000000000
2012-01-01	1.46918000000000000
2013-01-01	1.13747000000000000
2014-01-01	0.91375400000000010
2015-01-01	0.61780200000000010
2016-01-01	0.14657400000000000