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Provided link does not seem to be working anymore. Hence, I used other external data source
Used the source file shared by other users as the URL does not work anymore.
my solution attached
Never used the wayback machine before, but certainly came in handy to find this file that no longer exists.
Attaching my solution
Had to add an extra piece as 2015 numeric monthly data contained letters. Text manipulation is tedious work. This was a good text manipulation challenge.