How Many Years Passed In Lilo and Stitch Franchise?

I've been trying to get a reliable answer but I can't seem to find the right one. In the franchise series to Lilo and Stitch, I know what year each film and television show has premiered and ended in. Here's the listed in order.

Lilo and Stitch 2002 first film

Stitch! The Movie 2003

Lilo and Stitch: The Series 2003

Lilo and Stitch 2: Stitch Has A Glitch

Leroy and Stitch 2006

Stitch! Anime 2008

Stitch and Ai 2017

I listed them in chronological order. But I'm having a hard time finding out how many years do they play like have passed since the events from the first film all the way to the last adaptation at the bottom of the list. The timeline in their universe that is. So who knows how many years have gone by in the Lilo and Stitch universe from the events of the first film to the last adaptation. Let me know.