Mastery book drop list (post-revamp)

Do you know what the number appending after the monster name represents ?

Code:

[130] nibelrunggen ship [14]
[128] Red Dragon Turtle [6]
[107] Cold Shark [2]
[100] Crimson Balrog [40]
[55] Crimson Balrog [13]
[44] Crimson Balrog [21]

It's nothing special, just the number of comments on that monster's page.