Here's the whole list for anyone who's curious or doesn't plan on listening or anything. The early half of the decade dominated the list of course. The chart was determined by how many weeks the songs spent at #1. A good half of them spent 4 weeks while I'm assuming the few 3-weekers were determined based on how long they spent on the overall chart.
40. Arthur's Theme - Christopher Cross
39. Woman In Love - Barbra Streisand
38. Kiss On My List - Hall and Oates
37. Another One Bites The Dust - Queen
36. Another Day In Paradise - Phil Collins
35. Faith - George Michael
34. Miss You Much - Janet Jackson
33. Roll With It - Steve Winwood
32. Livin' On A Prayer - Bon Jovi
31. Walk Like An Egyptian - The Bangles
30. Say You, Say Me - Lionel Richie
29. That's What Friends Are For - Dionne and Friends
28. Total Eclipse of the Heart - Bonnie Tyler
27. Funkytown - Lipps Inc.
26. We Are The World - USA For Africa
25. Magic - Olivia Newton-John
24. All Night Long - Lionel Richie
23. Another Brick in the Wall - Pink Floyd
22. Down Under - Men At Work
21. Upside Down - Diana Ross
20. Maneater - Hall and Oates
19. Crazy Little Thing Called Love - Queen
18. Jack & Diane - John Cougar
17. Rock With You - Michael Jackson
16. When Doves Cry - Prince
15. Jump - Van Halen
14. Say, Say, Say - Paul McCartney and Michael Jackson
13. Like A Virgin - Madonna
12. Eye of the Tiger - Survivor
11. Flashdance...What A Feeling - Irene Cara
10. Lady - Kenny Rogers
9. Centerfold - J. Geils Band
8. Call Me - Blondie
7. I Love Rock 'n' Roll - Joan Jett and the Blackhearts
6. Billie Jean - Michael Jackson
5. Ebony & Ivory - Paul McCartney and Stevie Wonder
4. Every Breath You Take - The Police
3. Endless Love - Diana Ross and Lionel Richie
2. Bette Davis Eyes - Kim Carnes
1. Physical - Olivia Newton-John
They hadn't announced the first show of 2019 yet obviously with it being a special, but I'm thinking they'll do 1987, unless they suddenly care about overlapping from this month.