1952 01 99.99 -99.99  17.50 
1952 02 99.99 -99.99  17.90 
1952 03 99.99 -99.99  17.60 
1952 04 99.99 -99.99  18.50 
1952 08 99.99 -99.99  17.40 
1952 09 99.99 -99.99  17.40 
1952 10 99.99 -99.99  18.10 
1952 11 99.99 -99.99  17.90 
1952 12 99.99 -99.99  18.79 
1953 01 99.99 -99.99  18.20 
1953 02 99.99 -99.99  18.10 
1953 03 99.99 -99.99  18.00 
1953 04 99.99 -99.99  17.40 
1953 05 99.99 -99.99  16.90 
1953 06 99.99 -99.99  17.90 
1953 07 99.99 -99.99  16.00 
1953 08 99.99 -99.99  17.79 
1953 09 99.99 -99.99  17.00 
1953 10 99.99 -99.99  17.29 
1953 11 99.99 -99.99  16.79 
1953 12 99.99 -99.99  15.40 
1954 01 99.99 -99.99  15.60 
1954 02 99.99 -99.99  16.50 
1954 03 99.99 -99.99  16.50 
1954 04 99.99 -99.99  16.70 
1954 05 99.99 -99.99  16.70 
1954 06 99.99 -99.99  16.10 
1954 07 99.99 -99.99  16.10 
1954 08 99.99 -99.99  16.29 
1954 09 99.99 -99.99  16.20 
1954 10 99.99 -99.99  16.00 
1954 11 99.99 -99.99  16.00 
1954 12 99.99 -99.99  16.60 
1955 01 99.99 -99.99  15.80 
1955 02 99.99 -99.99  17.10 
1955 03 99.99 -99.99  16.29 
1955 04 99.99 -99.99  16.70 
1955 05 99.99 -99.99  16.10 
1955 06 99.99 -99.99  15.90 
1955 07 99.99 -99.99  15.40 
1955 08 99.99 -99.99  16.29 
1955 09 99.99 -99.99  16.60 
1955 10 99.99 -99.99  16.00 
1955 11 99.99 -99.99  15.40 
1955 12 99.99 -99.99  15.40 
1956 01 99.99 -99.99  15.10 
1956 02 99.99 -99.99  16.10 
1956 03 99.99 -99.99  16.29 
1956 04 99.99 -99.99  16.00 
1956 05 99.99 -99.99  16.60 
1956 06 99.99 -99.99  15.50 
1956 07 99.99 -99.99  15.30 
1956 08 99.99 -99.99  16.70 
1956 09 99.99 -99.99  15.80 
1956 10 99.99 -99.99  16.79 
1956 11 99.99 -99.99  16.60 
1956 12 99.99 -99.99  16.10 
1957 01 99.99 -99.99  15.80 
1957 02 99.99 -99.99  15.70 
1957 03 99.99 -99.99  16.20 
1957 04 99.99 -99.99  15.90 
1957 05 99.99 -99.99  16.79 
1957 06 99.99 -99.99  16.20 
1957 07 99.99 -99.99  15.70 
1957 08 99.99 -99.99  16.40 
1957 09 99.99 -99.99  15.60 
1957 10 99.99 -99.99  16.40 
1957 11 99.99 -99.99  16.60 
1957 12 99.99 -99.99  16.70 
1958 01 99.99 -99.99  16.79 
1958 02 99.99 -99.99  16.10 
1958 03 99.99 -99.99  17.00 
1958 04 99.99 -99.99  16.90 
1958 05 99.99 -99.99  15.80 
1958 06 99.99 -99.99  16.40 
1958 07 99.99 -99.99  16.60 
1958 08 99.99 -99.99  16.20 
1958 09 99.99 -99.99  16.60 
1958 10 99.99 -99.99  16.20 
1958 11 99.99 -99.99  15.80 
1958 12 99.99 -99.99  16.90 
1959 01 99.99 -99.99  16.70 
1959 02 99.99 -99.99  16.10 
1959 03 99.99 -99.99  16.60 
1959 04 99.99 -99.99  17.10 
1959 05 99.99 -99.99  16.90 
1959 06 99.99 -99.99  16.50 
1959 07 99.99 -99.99  15.80 
1959 08 99.99 -99.99  16.20 
1959 09 99.99 -99.99  16.20 
1959 10 99.99 -99.99  16.50 
1959 11 99.99 -99.99  16.40 
1959 12 99.99 -99.99  16.50 
1960 01 99.99 -99.99  16.00 
1960 02 99.99 -99.99  16.00 
1960 03 99.99 -99.99  16.29 
1960 04 99.99 -99.99  17.79 
1960 05 99.99 -99.99  18.00 
1960 06 99.99 -99.99  17.70 
1960 07 99.99 -99.99  16.79 
1960 08 99.99 -99.99  17.10 
1960 09 99.99 -99.99  17.10 
1960 10 99.99 -99.99  17.20 
1960 11 99.99 -99.99  17.10 
1960 12 99.99 -99.99  17.90 
