Working through the 1981 list, I wondered if douban had lists for other years.
So I searched on
douban.com 台湾电影目录- [x year].

Unfortunately, they have many more such lists.

1980
https://www.douban.com/doulist/45953600/

1982
https://www.douban.com/doulist/45958718/

1983
https://www.douban.com/doulist/45959293/

and so on.....
back from 1980 and forward from 1983.

Help ! I can't add all of these missing movies alone ......

What I can do, after finishing the 1981 list (there about 28 further to add), I can digest and cross-reference a few individual year lists with the same year here on HKMDB.

A mega-project.

"A mega-project", yup, I know how you feel, I'm working through my own at the moment. It's great hen you find new stuff, but so much to work through just leaves you exhausted and somewhat resentful of all you have left to do.

When I've finished my mega-project (hopefully) in a few weeks, I'll try and help out if possible, if it's just a matter of copying and pasting info and time being the real issue, I might be of use to lighten the load.

Good luck with it for now.