1975 05 99.99 -99.99  15.30 
1975 06 99.99 -99.99  17.70 
1975 07 99.99 -99.99  19.10 
1975 08 99.99 -99.99  18.79 
1975 09 99.99 -99.99  18.10 
1975 10 99.99 -99.99  10.80 
1975 11 99.99 -99.99   4.40 
1975 12 99.99 -99.99    .90 
1976 01 99.99 -99.99   -.30 
1976 02 99.99 -99.99    .60 
1976 03 99.99 -99.99   3.00 
1976 04 99.99 -99.99   9.30 
1976 05 99.99 -99.99  14.10 
1976 06 99.99 -99.99  16.00 
1976 07 99.99 -99.99  18.90 
1976 08 99.99 -99.99  16.20 
1976 09 99.99 -99.99  14.50 
1976 10 99.99 -99.99  12.30 
1976 11 99.99 -99.99   6.80 
1976 12 99.99 -99.99    .80 
1977 03 99.99 -99.99   8.50 
1977 04 99.99 -99.99   9.80 
1977 05 99.99 -99.99  15.40 
1977 06 99.99 -99.99  17.70 
1977 07 99.99 -99.99  20.40 
1977 09 99.99 -99.99  15.10 
1977 10 99.99 -99.99  11.00 
1978 03 99.99 -99.99   6.80 
1978 04 99.99 -99.99   9.39 
1978 05 99.99 -99.99  13.00 
1978 06 99.99 -99.99  17.29 
1978 07 99.99 -99.99  18.79 
1978 08 99.99 -99.99  19.20 
1978 09 99.99 -99.99  13.80 
1978 10 99.99 -99.99   9.80 
1978 11 99.99 -99.99   1.20 
1978 12 99.99 -99.99   2.90 
1979 01 99.99 -99.99  -2.00 
1979 02 99.99 -99.99   3.20 
1979 03 99.99 -99.99   7.90 
1979 04 99.99 -99.99   8.20 
1979 05 99.99 -99.99  14.50 
1979 06 99.99 -99.99  18.79 
1979 07 99.99 -99.99  18.29 
1979 08 99.99 -99.99  18.40 
1979 09 99.99 -99.99  15.20 
1979 10 99.99 -99.99  10.40 
1979 11 99.99 -99.99   7.10 
1979 12 99.99 -99.99   4.30 
1980 01 99.99 -99.99  -3.30 
1980 02 99.99 -99.99   1.80 
1980 03 99.99 -99.99   5.30 
1980 04 99.99 -99.99   7.90 
1980 05 99.99 -99.99  11.80 
1980 06 99.99 -99.99  16.90 
1980 07 99.99 -99.99  18.50 
1980 08 99.99 -99.99  19.00 
1980 09 99.99 -99.99  15.70 
1980 10 99.99 -99.99  11.80 
1980 11 99.99 -99.99   7.50 
1980 12 99.99 -99.99   -.40 
1981 01 99.99 -99.99  -3.70 
1981 02 99.99 -99.99    .90 
1981 03 99.99 -99.99   8.70 
1981 04 99.99 -99.99  10.00 
1981 05 99.99 -99.99  13.90 
1981 06 99.99 -99.99  19.50 
1981 07 99.99 -99.99  19.00 
1981 08 99.99 -99.99  19.00 
1981 09 99.99 -99.99  16.79 
1981 10 99.99 -99.99  13.00 
1981 11 99.99 -99.99    .70 
1981 12 99.99 -99.99   2.20 
1982 03  8.39    . 1   4.20 
1982 05 20.48  10.95  15.71 
1982 06 24.01  14.28  19.14 
1982 09 25.90  13.06  19.48 
1983 06 22.55  15.70  19.12 
1984 02  3.22    .35   1.78 
1985 05 22.73  14.47  18.60 
1987 06 23.45  13.67  18.56 
1988 08 30.02  14.37  22.19 
1989 06 21.62  11.78  16.70 
1990 04 14.49   5.69  10.09 
1991 10 16.45   6.64  11.54 
1992 05 20.06   9.30  14.68 
1992 06 23.39  12.94  18.16 
1992 08 31.78  15.74  23.76 
1993 04 15.43   5.39  10.41 
1993 07 27.10  13.55  20.32 
1994 05 22.04  10.62  16.33 
1994 06 25.05  12.90  18.97 
1995 06 24.56  13.54  19.04 
1997 05 21.11   8.97  15.04 
1997 07 25.74  14.69  20.21 
1998 04 17.10   6.70  11.90 
1998 07 28.80  14.42  21.61 
1998 09 20.42  11.46  15.94 
1998 10 17.58   7.76  12.67 
1998 11  5.81    .36   3.08 
1999 02  4.34  -4.40    .-2 
