1951 01 29.80  21.90  25.84 
1951 02 31.30  22.10  26.70 
1951 03 33.40  23.80  28.60 
1951 04 33.90  24.80  29.35 
1951 05 32.09  24.50  28.30 
1951 06 31.60  24.50  28.05 
1951 07 30.60  23.90  27.25 
1951 08 30.50  24.80  27.65 
1951 09 30.20  25.10  27.65 
1951 10 30.50  24.60  27.55 
1951 11 30.50  23.90  27.20 
1951 12 29.20  21.70  25.45 
1952 01 30.70  22.00  26.35 
1952 02 32.70  23.40  28.05 
1952 03 33.50  24.50  29.00 
1952 04 34.50  25.00  29.75 
1952 05 32.70  24.50  28.60 
1952 06 31.80  24.30  28.05 
1952 07 31.50  24.60  28.05 
1952 08 30.70  24.60  27.65 
1952 09 30.10  25.00  27.55 
1952 10 29.20  24.20  26.70 
1952 11 29.20  23.30  26.25 
1952 12 28.80  21.60  25.20 
1953 01 30.70  21.70  26.20 
1953 02 32.50  23.30  27.90 
1953 03 34.30  24.40  29.34 
1953 04 34.40  25.40  29.90 
1953 05 33.80  25.20  29.50 
1953 06 32.20  24.90  28.55 
1953 07 32.09  24.40  28.25 
1953 08 30.90  24.60  27.75 
1953 09 30.40  24.70  27.55 
1953 10 30.90  24.50  27.70 
1953 11 29.90  23.10  26.50 
1953 12 28.80  22.10  25.45 
1954 01 32.00  23.10  27.55 
1954 02 32.50  22.10  27.30 
1954 03 33.90  24.10  29.00 
1954 04 34.80  25.50  30.15 
1954 05 32.70  24.70  28.70 
1954 06 32.09  24.40  28.25 
1954 07 31.50  23.90  27.70 
1954 08 31.20  24.20  27.70 
1954 09 30.80  24.20  27.50 
1954 10 29.80  24.10  26.95 
1954 11 29.50  22.40  25.95 
1954 12 29.00  21.10  25.05 
1955 01 99.99 -99.99  24.70 
1955 02 99.99 -99.99  26.60 
1955 03 99.99 -99.99  28.50 
1955 04 99.99 -99.99  29.00 
1955 05 99.99 -99.99  27.90 
1955 06 99.99 -99.99  26.90 
1955 07 99.99 -99.99  27.40 
1955 08 99.99 -99.99  26.90 
1955 09 99.99 -99.99  26.90 
1955 10 99.99 -99.99  26.30 
1955 11 99.99 -99.99  25.20 
1955 12 99.99 -99.99  24.00 
1956 01 99.99 -99.99  24.40 
1956 02 99.99 -99.99  27.00 
1956 03 99.99 -99.99  28.90 
1956 04 99.99 -99.99  28.20 
1956 05 99.99 -99.99  27.10 
1956 06 99.99 -99.99  26.80 
1956 07 99.99 -99.99  26.90 
1956 08 99.99 -99.99  26.80 
1956 09 99.99 -99.99  26.60 
1956 10 99.99 -99.99  26.80 
1956 11 99.99 -99.99  25.10 
1956 12 99.99 -99.99  24.30 
1957 01 99.99 -99.99  25.10 
1957 02 99.99 -99.99  26.50 
1957 03 99.99 -99.99  27.60 
1957 04 99.99 -99.99  28.70 
1957 05 99.99 -99.99  29.20 
1957 06 99.99 -99.99  28.30 
1957 07 99.99 -99.99  26.90 
1957 08 99.99 -99.99  26.90 
1957 09 99.99 -99.99  26.90 
1957 10 99.99 -99.99  26.60 
1957 11 99.99 -99.99  26.30 
1957 12 99.99 -99.99  26.00 
1958 01 99.99 -99.99  26.70 
1958 02 99.99 -99.99  26.80 
1958 03 99.99 -99.99  29.40 
1958 04 99.99 -99.99  30.30 
1958 05 99.99 -99.99  29.00 
1958 06 99.99 -99.99  27.90 
1958 07 99.99 -99.99  27.10 
1958 08 99.99 -99.99  26.90 
1958 09 99.99 -99.99  26.90 
1958 10 99.99 -99.99  26.40 
1958 11 99.99 -99.99  25.50 
1958 12 99.99 -99.99  24.60 
1959 01 99.99 -99.99  25.30 
1959 02 99.99 -99.99  28.00 
1959 03 99.99 -99.99  28.00 
1959 04 99.99 -99.99  29.50 
1959 05 99.99 -99.99  28.70 
1959 06 99.99 -99.99  28.40 
1959 07 99.99 -99.99  26.70 
1959 08 99.99 -99.99  27.10 
1959 09 99.99 -99.99  27.20 
1959 10 99.99 -99.99  27.00 
1959 11 99.99 -99.99  26.70 
1959 12 99.99 -99.99  26.50 
1960 01 99.99 -99.99  25.90 
1960 02 99.99 -99.99  26.90 
1960 03 99.99 -99.99  29.10 
1960 04 99.99 -99.99  30.10 
1960 05 99.99 -99.99  28.10 
1960 06 99.99 -99.99  27.60 
1960 07 99.99 -99.99  27.60 
1960 08 99.99 -99.99  27.60 
1960 09 99.99 -99.99  27.10 
1960 10 99.99 -99.99  26.70 
1960 11 99.99 -99.99  26.50 
1960 12 99.99 -99.99  25.50 
