Why have I not been called for jury duty? How can I encourage that?

I’ve lived in this county for almost nine years – I’m a registered and active voter, and not too old or too young.

Yet I have never gotten a summons from either the County (or, for that matter, the federal government) for jury duty. I wouldn’t mind being called, first as a way to do my civic duty, and also because I find the process fascinating.

Is there a way to ‘encourage’ the county to pick me? (I thought they get random numbers off a list of citizens, so I don’t what mechanisms they might have to put me on the list)