New Mexico: Change in population (2013 vs 2016) since 2010 census. The map displays the county information (name and percentage of change), and the year of the census on mouseover. I am also using Mike Bostock's Choropleth example to fill colors and recreate the threshold scale.
Modified http://d3js.org/d3.v4.min.js to a secure url
Modified http://d3js.org/topojson.v2.min.js to a secure url
https://d3js.org/d3.v4.min.js
https://d3js.org/d3-scale-chromatic.v1.min.js
https://d3js.org/topojson.v2.min.js