Month	Hours
1984-01-01	158.4
1984-02-01	152.7
1984-03-01	157.7
1984-04-01	135.3
1984-05-01	155.4
1984-06-01	144.6
1984-07-01	143.8
1984-08-01	142.8
1984-09-01	143.3
1984-10-01	160.8
1984-11-01	151.3
1984-12-01	120.9
1985-01-01	154.2
1985-02-01	142.5
1985-03-01	152.2
1985-04-01	139.1
1985-05-01	152.5
1985-06-01	140.2
1985-07-01	147.1
1985-08-01	136.1
1985-09-01	148.5
1985-10-01	160.9
1985-11-01	146.9
1985-12-01	123.7
1986-01-01	152.9
1986-02-01	141.1
1986-03-01	141.0
1986-04-01	150.7
1986-05-01	145.3
1986-06-01	144.6
1986-07-01	148.0
1986-08-01	132.1
1986-09-01	150.7
1986-10-01	159.9
1986-11-01	140.8
1986-12-01	128.5
1987-01-01	148.7
1987-02-01	145.4
1987-03-01	160.5
1987-04-01	146.8
1987-05-01	144.0
1987-06-01	151.4
1987-07-01	146.4
1987-08-01	132.6
1987-09-01	154.9
1987-10-01	155.9
1987-11-01	153.5
1987-12-01	135.8
1988-01-01	145.7
1988-02-01	151.8
1988-03-01	161.5
1988-04-01	141.5
1988-05-01	153.6
1988-06-01	151.5
1988-07-01	137.2
1988-08-01	147.2
1988-09-01	152.1
1988-10-01	149.7
1988-11-01	152.5
1988-12-01	131.3
1989-01-01	153.0
1989-02-01	143.9
1989-03-01	149.3
1989-04-01	137.8
1989-05-01	152.7
1989-06-01	149.6
1989-07-01	137.3
1989-08-01	147.6
1989-09-01	145.8
1989-10-01	152.2
1989-11-01	154.3
1989-12-01	122.1