1968 01 99.99 -99.99   8.20 
1968 03 99.99 -99.99  17.60 
1968 06 99.99 -99.99  32.40 
1968 08 99.99 -99.99  29.70 
1968 10 99.99 -99.99  22.20 
1969 02 99.99 -99.99   4.30 
1969 05 99.99 -99.99  26.20 
1969 06 99.99 -99.99  32.09 
1969 07 99.99 -99.99  31.30 
1969 08 99.99 -99.99  30.10 
1969 09 99.99 -99.99  27.80 
1969 10 99.99 -99.99  24.40 
1969 11 99.99 -99.99  17.90 
1969 12 99.99 -99.99  13.80 
1970 03 99.99 -99.99  14.90 
1970 04 99.99 -99.99  19.79 
1970 11 99.99 -99.99  16.90 
1970 12 99.99 -99.99  13.10 
1971 01 99.99 -99.99   9.70 
1971 02 99.99 -99.99  12.10 
1971 03 99.99 -99.99  18.50 
1971 04 99.99 -99.99  26.10 
1971 05 99.99 -99.99  30.00 
1971 06 99.99 -99.99  31.20 
1971 07 99.99 -99.99  29.70 
1971 08 99.99 -99.99  29.50 
1971 09 99.99 -99.99  26.60 
1971 10 99.99 -99.99  22.70 
1971 11 99.99 -99.99  17.50 
1971 12 99.99 -99.99  13.60 
1972 01 99.99 -99.99  10.90 
1972 02 99.99 -99.99   8.39 
1972 03 99.99 -99.99  18.10 
1972 04 99.99 -99.99  21.90 
1972 05 99.99 -99.99  28.20 
1972 06 99.99 -99.99  31.60 
1972 07 99.99 -99.99  30.30 
1972 08 99.99 -99.99  28.90 
1972 09 99.99 -99.99  26.90 
1972 10 99.99 -99.99  21.10 
1972 11 99.99 -99.99  17.60 
1972 12 99.99 -99.99  11.50 
1973 01 99.99 -99.99   8.60 
1973 02 99.99 -99.99  13.60 
1973 03 99.99 -99.99  17.60 
1973 04 99.99 -99.99  25.20 
1973 05 99.99 -99.99  29.50 
1973 06 99.99 -99.99  32.80 
1973 07 99.99 -99.99  29.50 
1973 08 99.99 -99.99  28.20 
1973 09 99.99 -99.99  28.10 
1973 10 99.99 -99.99  22.80 
1973 11 99.99 -99.99  17.29 
1973 12 99.99 -99.99  10.70 
1974 01 99.99 -99.99  10.00 
1974 02 99.99 -99.99   9.70 
1974 03 99.99 -99.99  20.60 
1974 04 99.99 -99.99  24.80 
1974 05 99.99 -99.99  28.30 
1974 06 99.99 -99.99  31.00 
1974 07 99.99 -99.99  30.20 
1974 08 99.99 -99.99  30.30 
1974 09 99.99 -99.99  27.30 
1974 10 99.99 -99.99  21.90 
1974 11 99.99 -99.99  16.90 
1974 12 99.99 -99.99  10.50 
2002 11 22.04  12.82  17.43 
2004 09 34.25  22.18  28.22 
2006 12 15.46   7.17  11.31 
2007 04 32.16  19.52  25.84 
2007 09 32.02  19.81  25.91 
2007 10 29.22  16.31  22.76 
2007 11 25.78  11.86  18.82 
2008 01 12.57   2.87   7.72 
2008 02 21.12   7.67  14.39 
2008 07 34.16  23.74  28.95 
2009 01 16.12   4.92  10.52 
2009 02 20.31   8.39  14.35 
2009 04 28.20  16.70  22.45 
2009 05 35.91  24.33  30.12 
2009 08 34.37  25.13  29.75 
2009 09 34.88  21.98  28.43 
2009 10 28.92  16.26  22.59 
2009 12 17.98   6.48  12.23 
2010 03 27.50  14.78  21.14 
2010 05 35.59  23.61  29.60 
2010 08 31.04  23.30  27.17 
2010 09 31.62  20.57  26.09 
2011 05 36.29  23.38  29.83 
2011 07 34.04  23.19  28.61 
2011 08 31.39  23.14  27.26 
2011 10 28.53  15.93  22.23 
2011 12 18.14   6.05  12.09 
2012 01 13.80   2.54   8.17 
2012 02 15.52   4.23   9.88 
2012 03 24.42  11.60  18.01 
2012 04 28.02  17.10  22.56 
2012 05 33.90  22.31  28.10 
2012 06 36.48  24.58  30.53 
2012 07 35.88  24.93  30.40 
2012 08 32.58  23.29  27.93 
2012 10 28.18  15.10  21.64 
2013 02 16.70   5.83  11.27 
2013 05 34.73  21.77  28.25 
2013 08 32.77  22.35  27.56 
2013 09 33.74  21.21  27.47 
2013 10 29.33  16.79  23.06 
2013 12 17.36   5.40  11.38 
