1956 07 99.99 -99.99  -7.80 
1956 08 99.99 -99.99  -6.40 
1956 09 99.99 -99.99  -9.89 
1956 10 99.99 -99.99  -5.10 
1956 11 99.99 -99.99  -2.70 
1956 12 99.99 -99.99  -1.70 
1957 01 99.99 -99.99   -.10 
1957 02 99.99 -99.99   -.30 
1957 03 99.99 -99.99  -2.90 
1957 04 99.99 -99.99  -2.40 
1957 05 99.99 -99.99  -5.70 
1957 06 99.99 -99.99 -14.10 
1957 07 99.99 -99.99 -15.80 
1957 08 99.99 -99.99 -14.90 
1957 09 99.99 -99.99  -7.20 
1957 10 99.99 -99.99  -9.50 
1957 11 99.99 -99.99  -1.80 
1957 12 99.99 -99.99  -1.30 
1958 01 99.99 -99.99   -.30 
1958 02 99.99 -99.99  -1.50 
1958 03 99.99 -99.99  -3.20 
1958 04 99.99 -99.99  -5.20 
1958 05 99.99 -99.99 -10.70 
1958 06 99.99 -99.99 -14.50 
1958 07 99.99 -99.99 -15.90 
1958 08 99.99 -99.99 -18.79 
1958 09 99.99 -99.99 -15.40 
1958 10 99.99 -99.99  -6.80 
1958 11 99.99 -99.99  -1.90 
1958 12 99.99 -99.99  -2.70 
