Great blog! I was still too young in 1987 to listen to pop and rock music so there are some songs I don't know. My favourite songs from your 1987 countdown are "The Final Countdown" (though it has been overplayed), "Big Love" from Fleetwood Mac's fantastic "Tango In The Night" album, the two U2 classics, "La Isla Bonita" and "I Wanna Dance With Somebody" (one of Whitney's best).
1979 was one of the best years in music ever, "Gimme Gimme Gimme", "I Was Made For Loving You" and "Born To Be Alive" are all great!
What will be in the top 5? Maybe "Another Brick In The Wall", "Heart Of Glass", "Hold The Line", "The Logical Song" and "I Will Survive" ?