Plymouth parks footfall counters

Code for these charts can be found at:
https://github.com/thedataplace/thedataplace.github.io/blob/master/footfall.html
https://github.com/thedataplace/thedataplace.github.io/blob/master/makemap.js
Data is published under the Open Government Licence (OGL) at
https://plymouth.thedata.place/dataset/stumpd-counters-2019-devonport-hoe