Year	Hours
1977-01-01	171.0000
1978-01-01	169.0000
1979-01-01	168.0000
1980-01-01	166.0000
1981-01-01	158.5000
1982-01-01	155.2500
1983-01-01	154.5000
1984-01-01	151.0000
1985-01-01	150.2500
1986-01-01	151.2500
1987-01-01	149.2500
1988-01-01	150.2500
1989-01-01	147.2500
1990-01-01	146.9250
1991-01-01	146.1250
1992-01-01	145.9000
1993-01-01	145.1250
1994-01-01	145.6750
1995-01-01	145.3750
1996-01-01	144.2225
1997-01-01	143.3750
1998-01-01	142.6350
1999-01-01	142.2550
2000-01-01	140.4250
2001-01-01	140.0000
2002-01-01	139.5500
2003-01-01	138.9000
2004-01-01	137.7500
2005-01-01	136.9000
2006-01-01	136.0250
2007-01-01	135.4750
2008-01-01	135.2250
2009-01-01	132.5250
2010-01-01	132.1500
2011-01-01	130.9500
2012-01-01	130.2000
2013-01-01	129.7250
2014-01-01	129.1500
2015-01-01	129.1250
2016-01-01	128.7500
2017-01-01	128.9250