Ranking numbers of rap songs from MTV's year end countdowns 1986 to 1994
Plus. I'm sure there's more popular rap songs that were Top 40 hits in the '80's & 1990 from LL Cool J, Salt N' Pepa, De La Soul, Biz Markie, Rob Base & DJ EZ Rock, etc. Then again, there's more glaring omissions on MTV's year end lists...

Also noticed a very low count on 1992, though there's a fair number of R&B and some rock along with alternative, which the network tend to have more favortism towards...
1986 120. Walk This Way – Run DMC
1987 398. Run DMC - It's Tricky
73. Fat Boys feat. Beach Boys - Wipeout
50. Beastie Boys - (You Gotta) Fight For Your Right (To Party!)
1988 285. The Fat Boys feat. Chubby Checker - The Twist
22. DJ Jazzy Jeff & The Fresh Prince - Parents Just Don’t Understand
1989 485. Funky Cold Medina - Tone Loc
82. Friends - Jody Watley feat. Erik B & Rakim
63. Bust A Move - Young MC
39. Wild Thing - Tone Loc
1990 699. Public Enemy- 911 Is A Joke
72. Digital Underground- The Humpty Dance
61. MC Hammer- Have You Seen Her
23. MC Hammer- Pray
7. Vanilla Ice- Ice Ice Baby
1. MC Hammer- U Can't Touch This
1991 1995 Anthrax feat. Public Enemy - Bring the Noise
88 REM with KRS One - Radio Song
81 Gerardo - Rico Suave
79 Urban Dance Squad - Deeper Shade Of Soul
77 Marky Mark & The Funky Bunch - Wildside
73 Hammer - 2 Legit 2 Quit
67 Heavy D & The Boyz - Now That We Found Love
61 Salt 'n' Pepa - Do You Want Me
57 C+C Music Factory - Things That Make You Go Hmmm
55 Another Bad Creation - Playground
49 PM Dawn - Set Adrift On Memory Bliss
43 Hammer - Addams Groove
39 LL Cool J - Mama Said Knock You Out
33 Salt 'n' Pepa - Let's Talk About Sex
29 DJ Jazzy Jeff & The Fresh Prince - Summertime
26 C+C Music Factory - Here We Go, Let's Rock N Roll
24 Naughty By Nature - O.P.P.
20 Marky Mark & The Funky Bunch - Good Vibrations
8 C+C Music Factory - Gonna Make You Sweat (Everybody Dance Now)
1992 7
66 Kris Kross - Warm It Up
53 House Of Pain - Jump Around
47 Wreckx 'n' Effect - Rump Shaker
36 Sir Mix-A-Lot - Baby Got Back
27 Arrested Development - People Everyday
22 PM Dawn - I'd Die Without You
16 Kris Kross - Jump
1993 17100 Digable Planets - Rebirth Of Slick (Cool Like Dat)
87 2Pac - I Get Around
76 Ice Cube - Check Yo Self
61 Positive K - I Got A Man
51 Wreckx 'n' Effect - Rump Shaker (again)
44 Dr. Dre - Let Me Ride
39 Tag Team - Whoomp! (There It Is)
36 Ice Cube - It Was A Good Day
33 Snow - Informer
31 Salt 'n' Pepa - Shoop
30 PM Dawn - Looking Through Patient Eyes
26 Dr. Dre - Dre Day
22 Cypress Hill - Insane In The Brain
18 Snoop Doggy Dogg - What's My Name?
16 Arrested Development - Mr. Wendal
13 Onyx - Slam
8 Naughty By Nature - Hip Hop Hooray
3 Dr. Dre - Nuthin' But A ‘G’ Thang
There's a good amount of rap videos on MTV's
1994 year end countdown, though mostly gangsta rap...
1994 2093 Nuttin' but love/Heavy D & the Boyz
91 Funkdafied/Da Brat
88 Heaven 'n Hell/Salt-n-Pepa
77 Sure Shot/Beastie Boys
73 Do you see/Warren G
69 U.N.I.T.Y./Queen Latifah
63 You know how we do it/Ice Cube
59 Getto Jam/Domino
52 I Remember/Coolo
49 Here comes the hotstepper/Ini Kamoze
46 cantaloop/US3
40 Doggy Dogg world/Snoop Doggy Dogg
34 Bop Gun/Ice Cube
30 This D.J./Warren G
24 None of your business/Salt-n-Pepa
21 Murder was the case/Snoop Doggy Dogg
11 Regulate/Warren G
8 Fantastic Voyage/Coolio
5 Whatta Man/Salt-n-Pepe w/ En Vogue
3 Gin and Juice/Snoop Doggy Dogg