1951 01 99.99 -99.99  23.60 
1951 02 99.99 -99.99  23.70 
1951 03 99.99 -99.99  24.60 
1951 04 99.99 -99.99  23.80 
1952 01 99.99 -99.99  24.90 
1952 02 99.99 -99.99  24.10 
1952 04 99.99 -99.99  22.70 
1952 05 99.99 -99.99  22.00 
1952 06 99.99 -99.99  21.60 
1952 07 99.99 -99.99  20.90 
1952 08 99.99 -99.99  20.70 
1952 09 99.99 -99.99  20.80 
1952 10 99.99 -99.99  21.50 
1952 11 99.99 -99.99  22.00 
1952 12 99.99 -99.99  23.40 
1953 01 99.99 -99.99  23.50 
1953 02 99.99 -99.99  24.20 
1953 03 99.99 -99.99  23.60 
1953 04 99.99 -99.99  22.80 
1953 05 99.99 -99.99  22.70 
1953 06 99.99 -99.99  21.80 
1953 07 99.99 -99.99  21.20 
1953 08 99.99 -99.99  21.10 
1953 10 99.99 -99.99  21.60 
1953 11 99.99 -99.99  22.00 
1953 12 99.99 -99.99  23.10 
1954 01 99.99 -99.99  24.00 
1954 02 99.99 -99.99  23.50 
1954 03 99.99 -99.99  23.10 
1954 04 99.99 -99.99  22.30 
1954 05 99.99 -99.99  21.70 
1954 06 99.99 -99.99  21.10 
1954 07 99.99 -99.99  20.80 
1954 08 99.99 -99.99  20.60 
1954 09 99.99 -99.99  20.80 
1954 10 99.99 -99.99  21.20 
1954 11 99.99 -99.99  22.70 
1954 12 99.99 -99.99  22.90 
1955 01 99.99 -99.99  23.30 
1955 02 99.99 -99.99  23.50 
1955 03 99.99 -99.99  22.50 
1955 04 99.99 -99.99  22.50 
1955 05 99.99 -99.99  22.10 
1955 06 99.99 -99.99  21.20 
1955 07 99.99 -99.99  20.80 
1955 08 99.99 -99.99  20.50 
1955 09 99.99 -99.99  20.80 
1955 10 99.99 -99.99  21.60 
1955 11 99.99 -99.99  22.00 
1955 12 99.99 -99.99  22.20 
1956 01 99.99 -99.99  23.00 
1956 02 99.99 -99.99  23.20 
1956 03 99.99 -99.99  22.80 
1956 04 99.99 -99.99  22.10 
1956 05 99.99 -99.99  21.80 
1956 06 99.99 -99.99  20.70 
1956 07 99.99 -99.99  20.40 
1956 08 99.99 -99.99  20.80 
1956 09 99.99 -99.99  21.00 
1956 10 99.99 -99.99  21.00 
1956 11 99.99 -99.99  22.30 
1956 12 99.99 -99.99  22.10 
1957 01 99.99 -99.99  22.00 
1957 02 99.99 -99.99  23.20 
1957 03 99.99 -99.99  22.20 
1957 04 99.99 -99.99  22.10 
1957 05 99.99 -99.99  21.80 
1957 06 99.99 -99.99  21.20 
1957 07 99.99 -99.99  20.80 
1957 08 99.99 -99.99  21.00 
1957 09 99.99 -99.99  21.90 
1957 10 99.99 -99.99  21.50 
1957 11 99.99 -99.99  22.80 
1957 12 99.99 -99.99  22.00 
1958 01 99.99 -99.99  24.50 
1958 02 99.99 -99.99  24.50 
1958 03 99.99 -99.99  24.30 
1958 04 99.99 -99.99  24.10 
1958 05 99.99 -99.99  22.90 
1958 06 99.99 -99.99  21.60 
1958 07 99.99 -99.99  20.90 
1958 08 99.99 -99.99  20.90 
1958 09 99.99 -99.99  21.90 
1958 10 99.99 -99.99  22.30 
1958 11 99.99 -99.99  23.20 
1958 12 99.99 -99.99  23.50 
1959 01 99.99 -99.99  24.20 
1959 02 99.99 -99.99  24.50 
1959 03 99.99 -99.99  25.10 
1959 04 99.99 -99.99  23.50 
1959 05 99.99 -99.99  22.50 
1959 06 99.99 -99.99  21.60 
1959 07 99.99 -99.99  21.40 
1959 08 99.99 -99.99  20.29 
1959 09 99.99 -99.99  21.50 
1959 10 99.99 -99.99  22.10 
1959 11 99.99 -99.99  21.80 
1959 12 99.99 -99.99  23.60 
1960 01 99.99 -99.99  23.80 
1960 02 99.99 -99.99  23.80 
1960 03 99.99 -99.99  22.70 
1960 04 99.99 -99.99  22.30 
1960 05 99.99 -99.99  22.30 
1960 06 99.99 -99.99  21.60 
1960 07 99.99 -99.99  20.10 
1960 08 99.99 -99.99  21.20 
1960 09 99.99 -99.99  21.50 
1960 10 99.99 -99.99  21.80 
1960 11 99.99 -99.99  22.20 
1960 12 99.99 -99.99  23.80 
