Month	%
1950-05-01	66
1950-06-01	70
1950-07-01	72
1950-08-01	76
1950-09-01	74
1950-10-01	67
1950-11-01	64
1950-12-01	58
1951-01-01	62
1951-02-01	62
1951-03-01	61
1951-04-01	60
1951-05-01	58
1951-06-01	56
1951-07-01	51
1951-08-01	50
1951-09-01	52
1951-10-01	52
1951-11-01	49
1951-12-01	50
1952-01-01	51
1952-02-01	50
1952-03-01	49
1952-04-01	50
1952-05-01	46
1952-06-01	44
1952-07-01	43
1952-08-01	53
1952-09-01	59
1952-10-01	59
1952-11-01	59
1952-12-01	57
1953-01-01	56
1953-02-01	57
1953-03-01	59
1953-04-01	55
1953-05-01	52
1953-06-01	54
1953-07-01	53
1953-08-01	51
1953-09-01	49
1953-10-01	45
1953-11-01	41
1953-12-01	38
1954-01-01	41
1954-02-01	38
1954-03-01	40
1954-04-01	41
1954-05-01	42
1954-06-01	43
1954-07-01	42
1954-08-01	49
1954-09-01	61
1954-10-01	61
1954-11-01	55
1954-12-01	51
1955-01-01	58
1955-02-01	61
1955-03-01	63
1955-04-01	70
1955-05-01	68
1955-06-01	65
1955-07-01	60
1955-08-01	61
1955-09-01	66
1955-10-01	62
1955-11-01	56
1955-12-01	56
1956-01-01	57
1956-02-01	53
1956-03-01	56
1956-04-01	56
1956-05-01	50
1956-06-01	45
1956-07-01	49
1956-08-01	53
1956-09-01	57
1956-10-01	56
1956-11-01	52
1956-12-01	50
1957-01-01	50
1957-02-01	48
1957-03-01	49
1957-04-01	45
1957-05-01	48
1957-06-01	46
1957-07-01	51
1957-08-01	44
1957-09-01	49
1957-10-01	46
1957-11-01	41
1957-12-01	31
1958-01-01	33
1958-02-01	30
1958-03-01	30
1958-04-01	34
1958-05-01	43
1958-06-01	49
1958-07-01	49
1958-08-01	58
1958-09-01	61
1958-10-01	60
1958-11-01	63
1958-12-01	55
1959-01-01	56
1959-02-01	61
1959-03-01	62
1959-04-01	59
1959-05-01	59
1959-06-01	67
1959-07-01	62
1959-08-01	58
1959-09-01	55
1959-10-01	48
1959-11-01	48
1959-12-01	50
1960-01-01	55
1960-02-01	48
1960-03-01	47
1960-04-01	47
1960-05-01	46
1960-06-01	49
1960-07-01	1.e-37
1960-08-01	1.e-37
1960-09-01	1.e-37
1960-10-01	1.e-37
1960-11-01	1.e-37
1960-12-01	1.e-37