1968 06 99.99 -99.99  13.10 
1968 08 99.99 -99.99  13.40 
1969 06 99.99 -99.99  12.80 
1970 06 99.99 -99.99  11.90 
1970 07 99.99 -99.99  14.00 
1971 06 99.99 -99.99  15.20 
1971 07 99.99 -99.99  15.40 
1971 08 99.99 -99.99  15.90 
1973 06 99.99 -99.99  14.60 
1973 07 99.99 -99.99  17.20 
1973 08 99.99 -99.99  14.50 
1974 06 99.99 -99.99  14.40 
1975 06 99.99 -99.99  14.70 
1975 07 99.99 -99.99  18.10 
1982 06 99.99 -99.99  13.30 
1982 07 99.99 -99.99  16.40 
1983 05 99.99 -99.99   5.30 
1983 06 99.99 -99.99  13.70 
1983 07 99.99 -99.99  16.60 
1984 06 99.99 -99.99  13.80 
1984 07 99.99 -99.99  16.29 
1984 08 99.99 -99.99  17.50 
1985 06 99.99 -99.99  13.50 
1985 07 99.99 -99.99  15.10 
1986 06 99.99 -99.99  12.20 
1986 07 99.99 -99.99  15.70 
1987 06 99.99 -99.99  14.30 
1987 07 99.99 -99.99  15.60 
1988 06 99.99 -99.99  14.70 
1988 07 99.99 -99.99  15.30 
1989 06 99.99 -99.99  14.90 
1989 07 99.99 -99.99  17.50 
