Here are some of my Jeep XJ Cherokee notes:

1984: 10-slot grille
trim levels are base/Pioneer/Chief

1985: Laredo trim introduced
Chrome bumpers
Euro LHD version
2WD version introduced
Turbo-diesel model introduced

1986: nothing

1987: 4.0L introduced
Limited trim introduced mid-year

1988: New 8-slot grille
Sport 2-door introduced
Pioneer Olympic trim (one year only)

1989: Sport wheels discontinued
Anti=Lock Brakes introduced (ABS)

1990: Rear 3-point seatbelts introduced (can see hanging from rear window)
Last year for chrome bumpers, Chief trim and 4.0L

1991: Roof Rack change
4.0L High Output engine introduced
Briarwood trim and Sport 4-door introduced

1992: (I have Euro model but I have to look up what I meant by that)
First year for official police package
Last year for Base, Briarwood, Laredo and Limited trims

1993: SE and Country trim introduced
4x4 decal replaces raised logo on rear fenders
Sport body clad change
UK models introduced

1994: CHMSL added
Country in silver

1995: Airbag

1996: Classic trim introduced for one year

1997: 7-slot grille
smooth tailgate
larger mirrors
wheel well change
Last year for Country trim
Spare tire moved inside

1998: Classic & Limited trims brought back

1999: Sport models get color-coded bumpers and grilles

2000: Limited gets more chrome

2001: 60th anniversary model introduced