Year	Hours
1983-01-01	1981
1984-01-01	1964
1985-01-01	1970
1986-01-01	2003
1987-01-01	1984
1988-01-01	1991
1989-01-01	1998
1990-01-01	1988
1991-01-01	1954
1992-01-01	1908
1993-01-01	1883
1994-01-01	1883
1995-01-01	1875
1996-01-01	1882
1997-01-01	1832
1998-01-01	1754
1999-01-01	1725
2000-01-01	1719
2001-01-01	1713
2002-01-01	1698
2003-01-01	1671
2004-01-01	1668
2005-01-01	1654
2006-01-01	1645
2007-01-01	1634
2008-01-01	1601
2009-01-01	1541
2010-01-01	1545
2011-01-01	1543