D3: Bar Graph with Margin

Forked script below was converted from D3.js v3 to v4.

Data from United Nations Office on Drugs and Crime (Kabul) has been used for the new adapted version:

bar_graph_margin.html generated using D3 v4

The code below is the original posted version, which will run in D3 version 3.5.17. The data source used above is not the same as data below: