1956 01 29.60  21.70  25.65 
1956 02 30.50  22.60  26.55 
1956 03 31.60  22.90  27.25 
1956 04 31.40  22.70  27.05 
1956 05 30.50  22.50  26.50 
1956 06 30.80  22.10  26.45 
1956 07 30.50  22.30  26.40 
1956 08 30.80  22.20  26.50 
1956 09 30.60  22.30  26.45 
1956 10 31.00  22.30  26.65 
1956 11 30.50  22.20  26.35 
1956 12 31.00  22.40  26.70 
1960 01 30.20  22.80  26.50 
1960 02 30.80  22.80  26.80 
1960 03 31.20  23.40  27.30 
1960 04 31.20  23.10  27.15 
1960 05 30.80  22.90  26.84 
1960 06 30.40  22.80  26.59 
1960 07 30.50  22.60  26.55 
1960 08 30.40  22.80  26.59 
1960 09 31.40  23.00  27.20 
1960 10 30.80  22.90  26.84 
1960 11 30.40  22.70  26.55 
1960 12 30.50  22.40  26.45 
