This data is from the past 5 years or so, not sure to be honest.
1 YouTube 14,244,087
2 Spotify desktop 2,751,012
3 Monstercat 1,171,321
4 Pandora 895,765
5 VLC media player 892,006
6 iTunes 854,311
7 SoundCloud 724,019
8 YouTube Music 640,801
9 Deezer 501,474
10 Winamp 289,216
11 Foobar2000 251,726
12 Vk.com music 134,319
13 Aimp3 123,306
14 Musicbee 113,652
15 Google play music 89,827
16 Epidemicsound 87,573
17 Spotify web player 81,590
18 Media monkey 70,611
19 Amazon Music 55,691
20 Clementine 29,750
21 Tunein radio 24,413
22 Google play music desktop (community) 22,910
23 Media Player Classic Home Cinema 15,654
24 Pot player 11,348
25 Plug.dj 8,144
26 Tidal web player 7,770
27 Jriver media center 5,200
28 Digitally Imported di.fm 4,636
29 SiriusXM 2,397
30 Dubtrack.fm 1,031