1948 10 99.99 -99.99  24.90 
1949 07 99.99 -99.99  26.10 
1949 08 99.99 -99.99  27.40 
1949 09 99.99 -99.99  26.80 
1949 10 99.99 -99.99  23.90 
1950 06 99.99 -99.99  23.70 
1950 07 99.99 -99.99  26.40 
1950 10 99.99 -99.99  24.20 
1950 11 99.99 -99.99  21.80 
1950 12 99.99 -99.99  16.79 
1951 01 99.99 -99.99  15.90 
1951 02 99.99 -99.99  15.90 
1951 03 99.99 -99.99  16.50 
1951 04 99.99 -99.99  19.40 
1951 05 99.99 -99.99  21.10 
1951 06 99.99 -99.99  24.20 
1951 07 99.99 -99.99  26.90 
1951 08 99.99 -99.99  28.30 
1951 09 99.99 -99.99  27.30 
1951 10 99.99 -99.99  24.80 
1951 11 99.99 -99.99  21.00 
1951 12 99.99 -99.99  18.40 
1952 01 99.99 -99.99  16.50 
1952 02 99.99 -99.99  16.00 
1952 03 99.99 -99.99  17.50 
1952 04 99.99 -99.99  19.90 
1952 05 99.99 -99.99  22.20 
1952 06 99.99 -99.99  24.60 
1952 07 99.99 -99.99  26.60 
1952 08 99.99 -99.99  28.20 
1952 09 99.99 -99.99  28.20 
1952 10 99.99 -99.99  24.90 
1952 11 99.99 -99.99  22.40 
1952 12 99.99 -99.99  18.10 
1953 01 99.99 -99.99  15.70 
1953 02 99.99 -99.99  16.10 
1953 03 99.99 -99.99  17.70 
1953 04 99.99 -99.99  18.70 
1953 05 99.99 -99.99  21.00 
1953 06 99.99 -99.99  25.20 
1953 07 99.99 -99.99  27.30 
1953 08 99.99 -99.99  28.60 
1953 09 99.99 -99.99  27.90 
1953 10 99.99 -99.99  24.70 
1953 11 99.99 -99.99  21.60 
1954 06 99.99 -99.99  24.40 
1954 07 99.99 -99.99  27.20 
1954 08 99.99 -99.99  27.90 
1954 09 99.99 -99.99  27.30 
1954 10 99.99 -99.99  24.80 
1955 06 99.99 -99.99  24.80 
1955 07 99.99 -99.99  27.70 
1955 08 99.99 -99.99  27.60 
1955 09 99.99 -99.99  27.60 
1955 10 99.99 -99.99  25.20 
1956 06 99.99 -99.99  25.60 
1956 07 99.99 -99.99  28.20 
1956 08 99.99 -99.99  28.00 
1956 09 99.99 -99.99  27.80 
1956 10 99.99 -99.99  25.60 
1957 06 99.99 -99.99  23.00 
1957 07 99.99 -99.99  27.70 
1957 08 99.99 -99.99  28.00 
1957 09 99.99 -99.99  26.20 
1957 10 99.99 -99.99  23.60 
1958 06 99.99 -99.99  23.40 
1958 07 99.99 -99.99  26.60 
1958 08 99.99 -99.99  27.40 
1958 09 99.99 -99.99  27.20 
1958 10 99.99 -99.99  24.10 
1959 06 99.99 -99.99  23.60 
1959 07 99.99 -99.99  27.50 
1959 08 99.99 -99.99  27.90 
1959 09 99.99 -99.99  28.00 
1959 10 99.99 -99.99  24.80 
1960 06 99.99 -99.99  23.70 
1960 07 99.99 -99.99  27.40 
1960 08 99.99 -99.99  27.80 
1960 09 99.99 -99.99  27.30 
1960 10 99.99 -99.99  24.70 
