It's a graph, what is the point you are trying to illustrate?
That the Dems were in power at the time three terrible things happened; Things that seem to have helped to cause unemployment (Gulf War pt 1, 9/11-Gulf War the Sequel, financial meltdown)?
That the Reps hand over to the Dems messes then say "You caused it!"?
That the Reps lower unemployment?
Are you drawing a conclusion or a correlation or just a "Hey Look!"?
And do you have all the mitigating circumstances covered?
You can't really tell much from that graph.