Year	Hours
1955-01-01	36.9977047146402
1956-01-01	36.7911290322581
1957-01-01	36.9150744416873
1958-01-01	37.0390198511166
1959-01-01	37.1216501240695
1960-01-01	37.0803349875931
1961-01-01	36.8324441687345
1962-01-01	36.3986352357320
1963-01-01	36.6052109181141
1964-01-01	36.5019230769231
1965-01-01	36.1300868486352
1966-01-01	36.1094292803970
1967-01-01	35.9235111662531
1968-01-01	35.9441687344913
1969-01-01	35.6343052109181
1970-01-01	35.0765508684864
1971-01-01	34.7666873449132
1972-01-01	34.9112903225806
1973-01-01	35.0765508684864
1974-01-01	34.4155086848635
1975-01-01	34.1263027295285
1976-01-01	34.6014267990074
1977-01-01	34.9939205955335
1978-01-01	35.0972084367246
1979-01-01	34.9732630272953
1980-01-01	34.1263027295285
1981-01-01	34.1263027295285
1982-01-01	33.5478908188586
1983-01-01	33.5685483870968
1984-01-01	33.9403846153846
1985-01-01	33.9816997518610
1986-01-01	34.0849875930521
1987-01-01	34.1469602977667
1988-01-01	34.3122208436725
1989-01-01	34.2915632754342
1990-01-01	34.0849875930521
1991-01-01	33.6924937965261
1992-01-01	33.4859181141439
1993-01-01	33.3206575682382
1994-01-01	33.7338089330025
1995-01-01	33.7338089330025
1996-01-01	33.6305210918114
1997-01-01	33.7338089330025
1998-01-01	33.4239454094293
1999-01-01	33.4652605459057
2000-01-01	33.6511786600496
2001-01-01	32.9488213399504
2002-01-01	32.4943548387097
2003-01-01	32.8661910669975
2004-01-01	32.8248759305211
2005-01-01	33.0521091811414
2006-01-01	33.1500000000000
2007-01-01	33.2500000000000