Month	Number Of Units
1959-01-01	75716.0
1959-02-01	78999.0
1959-03-01	118963.
1959-04-01	127852.
1959-05-01	120791.
1959-06-01	120891.
1959-07-01	112262.
1959-08-01	106432.
1959-09-01	102492.
1959-10-01	94592.0
1959-11-01	75835.0
1959-12-01	73503.0
1960-01-01	62358.0
1960-02-01	68101.0
1960-03-01	89003.0
1960-04-01	101172.
1960-05-01	103473.
1960-06-01	94847.0
1960-07-01	86307.0
1960-08-01	93681.0
1960-09-01	84944.0
1960-10-01	81630.0
1960-11-01	73890.0
1960-12-01	58642.0
1961-01-01	59683.0
1961-02-01	58797.0
1961-03-01	92664.0
1961-04-01	94048.0
1961-05-01	105358.
1961-06-01	104551.
1961-07-01	92855.0
1961-08-01	108591.
1961-09-01	90299.0
1961-10-01	98046.0
1961-11-01	87329.0
1961-12-01	71659.0
1962-01-01	73189.0
1962-02-01	74625.0
1962-03-01	101421.
1962-04-01	120773.
1962-05-01	117512.
1962-06-01	106992.
1962-07-01	105849.
1962-08-01	110962.
1962-09-01	95204.0
1962-10-01	107611.
1962-11-01	94469.0
1962-12-01	77994.0
1963-01-01	81415.0
1963-02-01	76185.0
1963-03-01	104538.
1963-04-01	125773.
1963-05-01	133759.
1963-06-01	113919.
1963-07-01	116681.
1963-08-01	110031.
1963-09-01	110819.
1963-10-01	123163.
1963-11-01	95046.0
1963-12-01	93699.0