[Svartalfiar]

I have been called for jury duty every eighteen months for the past twelve years.

What county are you in? Slash is it in Texas?
From the jury summons I receive (Dallas/Collin County), you've got all this, which should get you out of that much jury duty that close to gether.

You may be exempted from jury service if:

8. you have served as a juror in a county during the 24-month period prior to the date you are required to appear for this summons. (Applies in counties of at least 200,000 unless the county uses a jury plan under Section 62.011, Government Code, and the period authorized under Section 62.011(b)(5) exceeds two years.); or

9. you have been summoned for service in a county with a population of at least 250,000 and you have served as a petit juror in the county during the three-year period preceding the date you are to appear for jury service, unless the jury wheel in your county has been reconstituted after the date you served as a juror.

[LegendHasIt]

I’m to the west of Texas.
Our entire county has a full time citizen population of about 10,000 people And that is counting children.

We do have some somewhat similar exemptions, but you have to jump through a bunch of hoops, and it is completely up to each of the three or four district judges that rotate through the County Court whether you are excused from his /her trials.