Year	Percent
1966-01-01	27.0153
1967-01-01	26.0282
1968-01-01	26.5855
1969-01-01	27.2623
1970-01-01	28.6497
1971-01-01	22.9027
1972-01-01	25.9424
1973-01-01	27.5543
1974-01-01	11.5631
1975-01-01	14.1621
1976-01-01	17.1079
1977-01-01	21.8978
1978-01-01	24.4537
1979-01-01	24.4537
1980-01-01	24.4537
1981-01-01	24.4537
1982-01-01	24.4537
1983-01-01	24.4537
1984-01-01	24.4537
1985-01-01	24.4537
1986-01-01	24.4537
1987-01-01	24.4537
1988-01-01	24.4537
1989-01-01	24.4537
1990-01-01	24.4537
1991-01-01	24.4537
1992-01-01	24.4537
1993-01-01	24.4537
1994-01-01	24.4537
1995-01-01	24.4537
1996-01-01	24.4537
1997-01-01	24.4537
1998-01-01	24.4537
1999-01-01	24.4537
2000-01-01	24.4537
2001-01-01	24.4537
2002-01-01	61.4841
2003-01-01	52.5496
2004-01-01	43.9403
2005-01-01	42.4027
2006-01-01	42.9483
2007-01-01	45.3989
2008-01-01	41.8897
2009-01-01	56.2388
2010-01-01	52.8087
2011-01-01	46.4411
2012-01-01	49.9099
2013-01-01	57.0696
2014-01-01	63.2337
2015-01-01	84.3989
2016-01-01	92.4086