Similar same could be done for downloads and streams pre 2018 (but probably best to keep them apart
Here are the top 50 best performing songs and their normalised scores, if we look separately at the Gaon annual top 100 for both streams and downloads, pre-2018:
STREAMING
01: Cherry Blossom Ending – Busker Busker [516.96%]
02: Wild Flower – Park Hyo-shin [386.54%]
03: No Matter Where – M.C The Max [303.52%]
04: Cheer Up – Twice [298.39%]
05: Friday (Feat. Jang Yi-jeong) – IU [294.36%]
06: Galaxy – Bolbbalgan4 [284.95%]
07: Some (Feat. Lil Boi of Geeks) – Soyou, Junggigo [281.87%]
08: Love Again – Im Chang-jung [280.49%]
09: Memory of the Wind – Naul [270.06%]
10: A Midsummer Night's Sweetness – San E, Raina [264.42%]
11: I Don't Love You – Urban Zakapa [260.21%]
12: Making a New Ending for This Story – Han Dong-geun [257.80%]
13: The Meaning of You (Feat. Kim Chang-wan) – IU [253.58%]
14: I Will Go to You Like the First Snow – Ailee [249.51%]
15: Me Gustas Tu – GFriend [243.73%]
16: Growl – EXO [235.98%]
17: Not Spring, Love, or Cherry Blossoms – High4, IU [235.28%]
18: Lost Stars – Adam Levine [233.38%]
19: Johnny (Feat. Dynamicduo) – Primary [233.25%]
20: D (Half Moon) (Feat. Gaeko) – Dean [233.19%]
21: TT – Twice [231.30%]
22: Don't Come Back (Feat. Yong Jun-hyung of Beast) – Heize [227.06%]
23: The Love I Committed – Im Chang-jung, [224.06%]
24: I'm Not the Only One – Sam Smith [223.53%]
25: Officially Missing You, Too – Geeks, Soyou [223.36%]
26: ? (Question Mark) (Feat. Choiza, Zion.T) – Primary [217.58%]
27: Hard to Love – Bolbbalgan4 [217.09%]
28: Stupid in Love – Soyou, Mad Clown [214.75%]
29: Gangnam Style – Psy [214.50%]
30: Amazing You – Han Dong-geun [211.85%]
31: Rough – GFriend [201.11%]
32: Bad Girl Good Girl – Miss A [199.50%]
33: If It Is You – Jung Seung-hwan [198.14%]
34: Boys and Girls (Feat. Babylon) – Zico [195.92%]
35: Good Day – IU [195.67%]
36: Through the Night – IU [195.33%]
37: Playing with Fire – Blackpink [195.17%]
38: Heartsore Story (Feat. Yong Jun-hyung) – Wheesung [195.06%]
39: Eyes, Nose, Lips – Taeyang [191.98%]
40: You & I – IU [191.76%]
41: Like It – Yoon Jong-shin [191.26%]
42: I Can't Go to Shinchon – Postmen [190.99%]
43: Tell Me You Love Me – Bolbbalgan4 [184.77%]
44: I Miss You – Noel [184.45%]
45: Can't Let You Go Even If I Die – 2AM [182.67%]
46: Maps – Maroon 5 [181.95%]
47: A Little Girl – Oh Hyuk [180.85%]
48: Bang Bang Bang – Big Bang [180.81%]
49: You in the Same Time – Naul [180.68%]
DOWNLOAD
01: Cherry Blossom Ending – Busker Busker [495.36%]
02: Wild Flower – Park Hyo-shin [356.38%]
03: I'm Not the Only One – Sam Smith [280.43%]
04: Cheer Up – Twice [265.17%]
05: No Matter Where – M.C The Max [263.99%]
06: The Meaning of You (Feat. Kim Chang-wan) – IU [258.91%]
07: Love Again – Im Chang-jung [258.55%]
08: Galaxy – Bolbbalgan4 [253.91%]
09: I Don't Love You – Urban Zakapa [251.88%]
10: Friday (Feat. Jang Yi-jeong) – IU [247.79%]
11: You & I – IU [238.68%]
12: Some (Feat. Lil Boi of Geeks) – Soyou, Junggigo [235.66%]
13: A Midsummer Night's Sweetness – San E, Raina [231.06%]
14: Making a New Ending for This Story – Han Dong-geun [226.45%]
15: Me Gustas Tu – GFriend [224.14%]
16: Don't Worry – Lee Juck [220.51%]
17: D (Half Moon) (Feat. Gaeko) – Dean [219.44%]
18: I Will Go to You Like the First Snow – Ailee [214.78%]
19: Lost Stars – Adam Levine [212.09%]
20: The Love I Committed – Im Chang-jung, [208.79%]
21: Hard to Love – Bolbbalgan4 [205.79%]
22: Trouble Maker – Trouble Maker [203.87%]
23: Don't Come Back (Feat. Yong Jun-hyung of Beast) – Heize [203.14%]
24: TT – Twice [202.95%]
25: Moves Like Jagger (Feat. Christina Aguilera) – Maroon 5 [202.34%]
26: Rough – GFriend [194.20%]
27: If It Is You – Jung Seung-hwan [193.65%]
28: Love Yourself – Justin Bieber [193.13%]
29: I (Feat. Verbal Jint) – Taeyeon [189.41%]
30: Memory of the Wind – Naul [188.59%]
31: Through the Night – IU [188.29%]
32: Gangnam Style – Psy [185.96%]
33: A Little Girl – Oh Hyuk [185.94%]
34: Amazing You – Han Dong-geun [185.34%]
35: Let It Go – Idina Menzel [184.99%]
36: Boys and Girls (Feat. Babylon) – Zico [184.64%]
37: Lovey-Dovey – T-ara [181.93%]
38: Playing with Fire – Blackpink [181.28%]
39: Shower of Tears (Feat. Ailee) – Baechigi [180.22%]
40: Roly-Poly – T-ara [179.20%]
41: Officially Missing You, Too – Geeks, Soyou [173.94%]
42: Tears (Feat. Eugene) – Leessang [173.09%]
43: Eyes, Nose, Lips – Taeyang [171.79%]
44: This Love – Davichi [170.53%]
45: Twenty-Three – IU [169.23%]
46: Can't Let You Go Even If I Die – 2AM [168.65%]
47: Russian Roulette – Red Velvet [167.62%]
48: Shape of You – Ed Sheeran [167.16%]
49: Oh! – Girls' Generation [166.84%]
50: Bang Bang Bang – Big Bang [166.53%]