Data behind this map is in this spreadsheet. You can publish your own map too.
FlowmapBlue
/19kZJ8t_jO1WmlnncuXqYHdf5nQAYLqPLdfXtWW-k8eE?v=-4.876383%2C-19.778484%2C2.09%2C0%2C0&a=0&as=1&b=1&bo=75&c=0&ca=1&d=1&fe=1<=1&lfm=ALL&t=15160101T000000%2C18630101T000000&col=PuRd&f=50
