1981 does have more streams that the other non-singles though, probably just because it's the first non-single you hear on the album and maybe the fact that it was the first song we heard for the album (live)
You can look for the streams each Green Day song and album is getting here
Songs - https://kworb.net/spotify/artist/7oPftvlwr6VrsViSDV7fJY_songs.html
Albums - https://kworb.net/spotify/artist/7oPftvlwr6VrsViSDV7fJY_albums.html
There's a lot of interesting things to take from these figures. Saviors (the album) is getting 296k daily streams now, less daily streams than AI/Dookie/Nimrod/21CB/Insomniac but still much more than the last few studio albums, though in the coming months/years, that figure will continue to fall. I think Saviors will continue to perform better than FOAM and the trilogy in terms of streaming however. Revolution Radio has a lot of total streams, being their 5th most streamed studio album, but is gaining much less streams than all their studio albums from 1994-2009. Father of All has more streams than Dos & Tré but less than Uno. I wouldn't be surprised if Dos starts gaining streams at a faster rate than FOAM at some point. Stray Heart is gaining daily streams faster than any other trilogy song, even more than Oh Love which is the hit of that era and has the most total streams. Considering Oh Love can be heard on both Uno and God's Favorite Band, this is surprising. Last Night on Earth is gaining a lot of streams, currently no. 12 in terms of daily streams, even though it was never released as a single.