Summation of colonns from an imported table
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I have imported a table conatining data for each month stretching over 10 years. My job is to calculate the average value of the data for each individual month over the 10 years. So my question is how can I sum all the values for each individual month? I can probably figure out how to calculate the average value but the problem is to take the value of the data and itterate it individually for every month over the years.