Hmm, hard to pin it down to a year.
my fave periods of being a U2 fan were 84-87, TUF-JT, incredibly intense period, incredible creativity, though I was a little young to fully appreciate it. I was about 11!
Or, 90-95, from when I heard Wild Irish Rose and Night and Day, up until Passengers. I liked Pop but was a little disapponted at the time. in 1991 I was 16, I had been a U2 fan for 6 years already but The Fly completely blew my head off, and still does every time i hear it, it;s my fave song of all time and helped shape my adolescence. Prior to that I got into U2 because my older bro had all their albums and I listened to all of them 1000's of times, but when The Fly came out, U2 became my band, not his! Then once the news of ZOO TV came out my world exploded, I went and saw it 15 times and my first trips abroad were going to see ZOO Tv, I recorded everything about it on Tv and still have about loads of old VHS Zoo Tv tapes from MTV that I still watch! Each time I see ZOO TV it blows me away as much as it did the first time, like The Fly. Don't even get me started on Achtung Baby, IMO the best allbum of all time by anybody.....
So I guess for me, because of ZOO TV, Achtung Baby and The Fly. It just has to be 1991!!!!!!!!!!!