DfI/2019-0382: EIR Request for information on the number of current 20mph limits and zones in place in Northern Ireland, by council area

Under the Freedom of Information Act, I would like to find out the following:

• The number of current 20mph limits in place in Northern Ireland, by council area; and
• The number of current 20mph zones in place in Northern Ireland, by council area.

If there is data available for previous annual or fiscal years for both of the above data sets that would be interesting to see, dating back to up to five years.