July August September October November December

59.87 59.95

50.72 50.84 52.50 53.57 53.14 54.16 54.85
56.03 55.84 56.51 57.38 55.78 59.31 57.21 60.94 60.99 61.1
58.49 59.47 59.52 58.89 59.40 60.15 59.06 57.51 60-1
60.87 61.22 62.21 60.96 63.77 64.57 65.48 65.80 67.

56.06

55.86 57.1

1951

1952

1953

1954

78.91

1955

82.40

70.90 67.65 68.39 69.72 70.64 70.64 70.47 69.31 70.64 72.59 72.08 71.91 74.
74.27 72.93 73.10 73.35 71.45 72.83 71.97 70.93 73.87 76.25 77.47 77.53 79.
79.71 77.78 78.63 79.18 79.00 79.24 79.85 78.40
80.98 79.87 82.41 80.83 82.
79.65 78.88 78.28 77.71 78.69 79.65 78.53 79.13 78.74 78.96 78.96 79.
77.99 77.60 78.57 79.37 80.95 82.76
83.02 84.03 85.69 86.31 85.08 85.