1951 01 99.99 -99.99  13.70 
1951 02 99.99 -99.99  15.90 
1951 03 99.99 -99.99  21.60 
1951 04 99.99 -99.99  24.80 
1951 05 99.99 -99.99  31.10 
1951 06 99.99 -99.99  31.20 
1951 07 99.99 -99.99  31.70 
1951 08 99.99 -99.99  32.00 
1951 09 99.99 -99.99  30.60 
1951 10 99.99 -99.99  27.20 
1951 11 99.99 -99.99  19.70 
1951 12 99.99 -99.99  13.30 
1952 01 99.99 -99.99  14.20 
1952 02 99.99 -99.99  15.80 
1952 03 99.99 -99.99  19.00 
1952 04 99.99 -99.99  25.60 
1952 05 99.99 -99.99  29.80 
1952 06 99.99 -99.99  30.80 
1952 07 99.99 -99.99  31.20 
1952 08 99.99 -99.99  32.50 
1952 09 99.99 -99.99  31.00 
1952 10 99.99 -99.99  27.20 
1952 11 99.99 -99.99  19.50 
1952 12 99.99 -99.99  16.50 
1953 01 99.99 -99.99  13.70 
1953 02 99.99 -99.99  16.39 
1953 03 99.99 -99.99  18.39 
1953 04 99.99 -99.99  25.50 
1953 05 99.99 -99.99  30.20 
1953 06 99.99 -99.99  31.60 
1953 07 99.99 -99.99  32.09 
1953 08 99.99 -99.99  31.90 
1953 09 99.99 -99.99  28.30 
1953 10 99.99 -99.99  26.50 
1953 11 99.99 -99.99  19.00 
1953 12 99.99 -99.99  14.20 
1954 01 99.99 -99.99  12.40 
1954 02 99.99 -99.99  14.40 
1954 03 99.99 -99.99  19.39 
1954 04 99.99 -99.99  24.20 
1954 05 99.99 -99.99  29.90 
1954 06 99.99 -99.99  30.50 
1954 07 99.99 -99.99  30.90 
1954 08 99.99 -99.99  31.80 
1954 09 99.99 -99.99  28.00 
1954 10 99.99 -99.99  25.60 
1954 11 99.99 -99.99  19.89 
1954 12 99.99 -99.99  15.00 
1955 01 99.99 -99.99  14.80 
1955 02 99.99 -99.99  16.79 
1955 03 99.99 -99.99  19.89 
1955 04 99.99 -99.99  25.20 
1955 05 99.99 -99.99  29.20 
1955 06 99.99 -99.99  31.50 
1955 07 99.99 -99.99  30.90 
1955 08 99.99 -99.99  30.60 
1955 09 99.99 -99.99  29.80 
1955 10 99.99 -99.99  26.40 
1955 11 99.99 -99.99  20.39 
1955 12 99.99 -99.99  14.80 
1956 01 99.99 -99.99  13.80 
1956 02 99.99 -99.99  16.89 
1956 03 99.99 -99.99  19.20 
1956 04 99.99 -99.99  25.00 
1956 05 99.99 -99.99  27.60 
1956 06 99.99 -99.99  31.30 
1956 07 99.99 -99.99  31.20 
1956 08 99.99 -99.99  32.90 
1956 09 99.99 -99.99  28.60 
1956 10 99.99 -99.99  24.70 
1956 11 99.99 -99.99  19.60 
1956 12 99.99 -99.99  14.40 
1957 01 99.99 -99.99  12.40 
1957 02 99.99 -99.99  15.30 
1957 03 99.99 -99.99  19.00 
1957 04 99.99 -99.99  24.60 
1957 05 99.99 -99.99  30.20 
1957 06 99.99 -99.99  30.50 
1957 07 99.99 -99.99  30.90 
1957 08 99.99 -99.99  32.29 
1957 09 99.99 -99.99  30.60 
1957 10 99.99 -99.99  27.70 
1957 11 99.99 -99.99  21.70 
1957 12 99.99 -99.99  16.10 
1958 01 99.99 -99.99  14.80 
1958 02 99.99 -99.99  16.79 
1958 03 99.99 -99.99  20.60 
1958 04 99.99 -99.99  28.40 
1958 05 99.99 -99.99  29.40 
1958 06 99.99 -99.99  30.80 
1958 07 99.99 -99.99  30.80 
1958 08 99.99 -99.99  31.80 
1958 09 99.99 -99.99  29.60 
1958 10 99.99 -99.99  25.60 
1958 11 99.99 -99.99  23.00 
1958 12 99.99 -99.99  18.60 
1959 01 99.99 -99.99  14.20 
1959 02 99.99 -99.99  12.80 
1959 03 99.99 -99.99  19.29 
1959 04 99.99 -99.99  26.00 
1959 05 99.99 -99.99  30.60 
1959 06 99.99 -99.99  31.80 
1959 07 99.99 -99.99  30.00 
1959 08 99.99 -99.99  31.80 
1959 09 99.99 -99.99  28.70 
1959 10 99.99 -99.99  25.20 
1959 11 99.99 -99.99  21.30 
1959 12 99.99 -99.99  17.39 
1960 01 99.99 -99.99  14.00 
1960 02 99.99 -99.99  16.89 
1960 03 99.99 -99.99  20.39 
1960 04 99.99 -99.99  26.20 
1960 05 99.99 -99.99  29.50 
1960 06 99.99 -99.99  30.70 
1960 07 99.99 -99.99  31.60 
1960 08 99.99 -99.99  31.80 
1960 09 99.99 -99.99  30.10 
1960 10 99.99 -99.99  28.20 
1960 11 99.99 -99.99  21.80 
1960 12 99.99 -99.99  20.10 
