Remove the pre-2002 data from the NC data import
Remove the pre-2002 data from the NC data import

According to the client, the various NC police agencies were not
consistently reporting the data until 1 Jan 2002, so any data before
that will be a biased sample.  The NC Highway Patrol, however, was
consistently reporting, so we leave those data points in the data set.

OpenDataPolicingNC/Traffic-Stops,OpenDataPolicingNC/Traffic-Stops,OpenDataPolicingNC/Traffic-Stops,OpenDataPolicingNC/Traffic-Stops