Modelling population changes with years on a network graph This may be a silly question, apologies if it is. And further apologies if I've said something wrong.

Network graphs, or visualisations look somewhat like this, with each node representing a thing connected to another thing. So for my example, I'd like to model population changes for refugees from their origin country to their destination country.

I've been tasked to create a graph which shows a similar change over a period of years, but I am really not sure how years could be modelled? e.g. how would a graph like the example above, show a change in years?

Edit: preferably using the NodeXL plugin
The Sankey diagram would be nicely suited for your problem statement.

The flow width can be the number of refugees migrated, and the end nodes can be the destinations (from and to) of the refugees, and the flow width would be the magnitude of refugee migration.

If you want to model the graph on a geographical map, it can look something like this:



I am not sure whether it can be done in NodeXL or not.  But, a google search has returned me this link.