Updates:
-Using Tables for neater display; user options for text size, color and table position.
-Option for custom number of lookback years to display(0-10).
-Option to show 10yr averages or not (10yrs back from the input start year).
-Added averaging function to account for NaN values: if current month of start year has not yet elapsed, 9yr average will be displayed, otherwise 10yr average.