Oh, well, Chuck. You can't exactly say she had retired during the 90s, with that many #2 albums.
You got that right, Debs. I tried to find what albums kept her from #1, but I don't have the dates of the charts, so I can't do a good Google search on it.
Well, I just spent some time on the Billboard Magazine website, they have archives from past issues online, and I was able to fine the Top 200 for the weeks that Madonna was at #2. It's actually funny to see some of the artists there with her and wonder, "What are they doing now?"
BILLBOARD 200: Week of June 23, 1990:
#1 Please Hammer Dont Hurt Em M.C. HAMMER
#2 Im Breathless MADONNA
#3 I Do Not Want What I Havent Got SINEAD OCONNOR
#4 Pretty Woman SOUNDTRACK
#5 Poison BELL BIV DEVOE
BILLBOARD 200: Week of January 26, 1991:
#1 To The Extreme VANILLA ICE
#2 The Immaculate Collection MADONNA
#3 The Simpsons Sing The Blues THE SIMPSONS
#4 Please Hammer Dont Hurt Em M.C. HAMMER
#5 Mariah Carey MARIAH CAREY
BILLBOARD 200: Week of November 7, 1992:
#1 The Chase GARTH BROOKS
#2 Erotica MADONNA
#3 Unplugged ERIC CLAPTON
#4 Some Gave All BILLY RAY CYRUS
#5 Automatic For The People R.E.M
BILLBOARD 200: Week of February 15, 1997:
#1 Tragic Kingdon NO DOUBT
#2 Evita MADONNA
#3 Romeo & Juliet VARIOUS ARTISTS
#4 Falling Into You CELINE DION
#5 Space Jam VARIOUS ARTISTS
BILLBOARD 200: Week of March 21, 1998:
#1 Titanic VARIOUS ARTISTS
#2 Evita MADONNA
#3 Let's Talk About Love CELINE DION
#4 My Homies SCARFACE
#5 Savage Garden SAVAGE GARDEN