1952 01 99.99 -99.99  26.00 
1952 02 99.99 -99.99  27.60 
1952 03 99.99 -99.99  30.10 
1952 04 99.99 -99.99  29.80 
1952 05 99.99 -99.99  30.20 
1952 06 99.99 -99.99  28.80 
1952 07 99.99 -99.99  26.40 
1952 08 99.99 -99.99  27.10 
1952 09 99.99 -99.99  29.40 
1952 10 99.99 -99.99  29.40 
1952 11 99.99 -99.99  28.20 
1952 12 99.99 -99.99  26.00 
1953 01 99.99 -99.99  26.10 
1953 02 99.99 -99.99  27.70 
1953 03 99.99 -99.99  28.40 
1953 04 99.99 -99.99  30.80 
1953 05 99.99 -99.99  29.20 
1953 06 99.99 -99.99  29.00 
1953 07 99.99 -99.99  28.20 
1953 08 99.99 -99.99  27.90 
1953 09 99.99 -99.99  30.30 
1953 10 99.99 -99.99  28.90 
1953 11 99.99 -99.99  28.70 
1953 12 99.99 -99.99  25.90 
1954 01 99.99 -99.99  27.30 
1954 02 99.99 -99.99  27.20 
1954 03 99.99 -99.99  29.50 
1954 04 99.99 -99.99  28.40 
1954 05 99.99 -99.99  31.40 
1954 06 99.99 -99.99  28.10 
1954 07 99.99 -99.99  29.70 
1954 08 99.99 -99.99  27.50 
1954 09 99.99 -99.99  29.40 
1954 10 99.99 -99.99  28.90 
1954 11 99.99 -99.99  27.60 
1954 12 99.99 -99.99  27.20 
1955 01 99.99 -99.99  26.60 
1955 02 99.99 -99.99  27.30 
1955 03 99.99 -99.99  29.80 
1955 04 99.99 -99.99  29.30 
1955 05 99.99 -99.99  29.80 
1955 06 99.99 -99.99  28.40 
1955 07 99.99 -99.99  29.50 
1955 08 99.99 -99.99  29.30 
1955 09 99.99 -99.99  30.50 
1955 10 99.99 -99.99  29.00 
1955 11 99.99 -99.99  27.10 
1955 12 99.99 -99.99  27.30 
1956 01 99.99 -99.99  26.70 
1956 02 99.99 -99.99  27.70 
1956 03 99.99 -99.99  28.40 
1956 04 99.99 -99.99  30.20 
1956 05 99.99 -99.99  27.10 
1956 06 99.99 -99.99  28.80 
1956 07 99.99 -99.99  27.30 
1956 08 99.99 -99.99  27.70 
1956 09 99.99 -99.99  29.30 
1956 10 99.99 -99.99  29.20 
1956 11 99.99 -99.99  27.70 
1956 12 99.99 -99.99  27.00 
1957 01 99.99 -99.99  26.90 
1957 02 99.99 -99.99  27.90 
1957 03 99.99 -99.99  29.70 
1957 04 99.99 -99.99  29.80 
1957 05 99.99 -99.99  30.30 
1957 06 99.99 -99.99  30.10 
1957 07 99.99 -99.99  30.30 
1957 08 99.99 -99.99  28.40 
