Month	Millions Of Pairs
1953-01-01	9.17000
1953-02-01	8.94000
1953-03-01	9.33000
1953-04-01	9.18000
1953-05-01	8.72000
1953-06-01	8.31000
1953-07-01	7.72000
1953-08-01	8.13000
1953-09-01	7.84000
1953-10-01	8.18000
1953-11-01	6.95000
1953-12-01	8.27000
1954-01-01	8.04000
1954-02-01	7.81000
1954-03-01	8.58000
1954-04-01	8.06000
1954-05-01	7.14000
1954-06-01	7.81000
1954-07-01	6.78000
1954-08-01	7.85000
1954-09-01	7.51000
1954-10-01	8.09000
1954-11-01	7.88000
1954-12-01	8.93000
1955-01-01	8.90000
1955-02-01	8.77000
1955-03-01	9.81000
1955-04-01	9.11000
1955-05-01	8.92000
1955-06-01	8.89000
1955-07-01	7.41000
1955-08-01	9.32000
1955-09-01	9.13000
1955-10-01	9.25000
1955-11-01	7.90000
1955-12-01	8.71000
1956-01-01	9.68000
1956-02-01	10.3000
1956-03-01	10.0200
1956-04-01	9.88000
1956-05-01	10.0300
1956-06-01	8.09000