Monthly Number Of Units
1954-01-01 54801.0
1954-02-01 65574.0
1954-03-01 93438.0
1954-04-01 99595.0
1954-05-01 90981.0
1954-06-01 104294.
1954-07-01 96214.0
1954-08-01 98195.0
1954-09-01 96114.0
1954-10-01 93806.0
1954-11-01 87475.0
1954-12-01 76020.0
1955-01-01 77413.0
1955-02-01 76997.0
1955-03-01 114494.
1955-04-01 118576.
1955-05-01 117750.
1955-06-01 113158.
1955-07-01 97497.0
1955-08-01 106353.
1955-09-01 95739.0
1955-10-01 88234.0
1955-11-01 69728.0
1955-12-01 56692.0
1956-01-01 61836.0
1956-02-01 70095.0
1956-03-01 92265.0
1956-04-01 97135.0
1956-05-01 94737.0
1956-06-01 85785.0
1956-07-01 80541.0
1956-08-01 85441.0
1956-09-01 68625.0
1956-10-01 76829.0
1956-11-01 61051.0
1956-12-01 47543.0
1957-01-01 50837.0
1957-02-01 54408.0
1957-03-01 72778.0
1957-04-01 80501.0
1957-05-01 84149.0
1957-06-01 75354.0
1957-07-01 73712.0
1957-08-01 78097.0
1957-09-01 70950.0
1957-10-01 75230.0
1957-11-01 55493.0
1957-12-01 48813.0
1958-01-01 53472.0
1958-02-01 47995.0
1958-03-01 68710.0
1958-04-01 85619.0
1958-05-01 86292.0
1958-06-01 88330.0
1958-07-01 96479.0
1958-08-01 91652.0
1958-09-01 93594.0
1958-10-01 98665.0
1958-11-01 80974.0
1958-12-01 67802.0
1959-01-01 68346.0
1959-02-01 71071.0
1959-03-01 108330.
1959-04-01 116986.
1959-05-01 110628.
1959-06-01 109375.
1959-07-01 102082.
1959-08-01 96705.0
1959-09-01 92848.0
1959-10-01 86032.0
1959-11-01 68058.0
1959-12-01 66035.0
1960-01-01 56999.0
1960-02-01 60484.0
1960-03-01 81196.0
1960-04-01 91265.0