Create summary table showing news from new data since previous results
Table showing new datapoints that were not in the previous results’ data. Columns are:
update date : date associated with a new data point.
updated variable : variable for which new data was added at update date.
forecast (prev) : the forecast value for the updated variable at the update date in the previous results object (i.e. prior to the data being available).
observed : the observed value of the new datapoint.