How often do you check the pressure of your spare tire?

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Mazda CX-9 2012 Grand Touring FWD
I had my 2012 CX-9 GT serviced this weekend. Before going to the dealership, it occurred to me that, in the two and a half years I've owned the car, I'd never checked the pressure of the spare tire, so I had the dealership do it as they were rotating the tires anyway. Pressure was low and they inflated it. I won't make that mistake again. While checking the pressure of the spare is on their checklist, I got the distinct impression that they don't usually do it. Getting a flat that needs to be changed is made worse if the spare is flat too!
 
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