When did we start calling New Orleans "Nola"?

I moved to New Orleans in the early '90s, and I don't think people called New Orleans "Nola" then? Am I remembering right?

I have vague memories writing a letter and calling the city "NO" and remembering it didn't feel right on the page, as an aggressive NO! I also think I addressed letters with "NO, LA" (note the comma).

As I see my memories are about writing letters, I guess "Nola" arrived with the Internet?