Month	Hours
1947-01-01	41.9000
1947-02-01	41.8000
1947-03-01	41.5000
1947-04-01	41.2000
1947-05-01	41.3000
1947-06-01	41.5000
1947-07-01	40.7000
1947-08-01	41.0000
1947-09-01	41.4000
1947-10-01	42.3000
1947-11-01	42.0000
1947-12-01	42.8000
1948-01-01	42.1000
1948-02-01	41.8000
1948-03-01	41.7000
1948-04-01	40.8000
1948-05-01	40.7000
1948-06-01	40.6000
1948-07-01	40.1000
1948-08-01	40.6000
1948-09-01	40.7000
1948-10-01	41.6000
1948-11-01	40.7000
1948-12-01	41.2000
1949-01-01	39.4000
1949-02-01	39.8000
1949-03-01	39.6000
1949-04-01	38.7000
1949-05-01	38.5000
1949-06-01	39.0000
1949-07-01	38.6000
1949-08-01	40.4000
1949-09-01	41.0000
1949-10-01	41.7000
1949-11-01	41.2000
1949-12-01	42.2000
1950-01-01	41.1000
1950-02-01	41.7000
1950-03-01	41.7000
1950-04-01	41.3000
1950-05-01	41.2000
1950-06-01	41.8000
1950-07-01	41.0000
1950-08-01	42.8000
1950-09-01	42.6000
1950-10-01	42.6000
1950-11-01	42.6000
1950-12-01	42.3000
1951-01-01	41.5000
1951-02-01	42.1000
1951-03-01	42.2000
1951-04-01	41.0000
1951-05-01	40.3000
1951-06-01	40.3000
1951-07-01	39.6000
1951-08-01	40.6000
1951-09-01	41.2000
1951-10-01	41.4000
1951-11-01	41.2000
1951-12-01	42.1000
1952-01-01	41.4000
1952-02-01	41.4000
1952-03-01	41.2000
1952-04-01	40.5000
1952-05-01	40.8000
1952-06-01	41.0000
1952-07-01	40.4000
1952-08-01	41.4000
1952-09-01	42.1000
1952-10-01	42.5000
1952-11-01	42.1000
1952-12-01	42.9000
1953-01-01	41.4000
1953-02-01	41.5000
1953-03-01	41.7000
1953-04-01	41.3000
1953-05-01	41.0000
1953-06-01	41.0000
1953-07-01	39.9000
1953-08-01	40.9000
1953-09-01	40.5000
1953-10-01	41.1000
1953-11-01	40.7000
1953-12-01	40.7000
1954-01-01	39.6000
1954-02-01	40.1000
1954-03-01	40.1000
1954-04-01	39.1000
1954-05-01	38.8000
1954-06-01	39.6000
1954-07-01	39.5000
1954-08-01	40.6000
1954-09-01	40.8000
1954-10-01	41.2000
1954-11-01	40.9000
1954-12-01	41.4000
1955-01-01	40.5000
1955-02-01	41.3000
1955-03-01	41.3000
1955-04-01	40.3000
1955-05-01	40.7000
1955-06-01	41.6000
1955-07-01	40.6000
1955-08-01	42.0000
1955-09-01	42.3000
1955-10-01	42.4000
1955-11-01	42.0000
1955-12-01	42.3000
1956-01-01	40.8000
1956-02-01	41.1000
1956-03-01	41.0000
1956-04-01	40.2000
1956-05-01	39.9000
1956-06-01	40.3000
1956-07-01	40.2000
1956-08-01	41.1000
1956-09-01	41.3000
1956-10-01	41.6000
1956-11-01	40.5000
1956-12-01	41.7000