# 3.13:  start a new program based on the logic of the previous one, to build a sum of values:
# before the loop begins, initialize a "floatsum" variable to 0.  then looping through the data, if
# the year is 1928, select out the 2nd column (the 1st column of float values), convert it to a
# float, and add it to the floatsum variable.  report the sum at the end.

# Expected Output:

# 3.88

