This function compacts the data to information on month and year of each fatality in the (vector of) year(s) of the fars-dataset
a list of one or more integers, representing the years of data to be read
a list with an item, for each year, consisting of a dataframe with the same number of rows as the dataset of that specific year.
The columns in the dataframe are 'MONTH' and 'year'
for each for which an error occurs (dataset not found of returning an error) a warning is returned
Ã�n value[[3L]](cond) : invalid year :
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