Here's how much Pokemon each type has confirmed so far, this is including two starter evoes for their primary types but not including other unveiled Mons we obviously know exist (like the greyhound Yamper evo we've seen the silhouette of in-game).

Grass: 22
Fire: 11
Water: 35
Normal: 16
Bug: 12
Flying: 23
Electric: 15
Poison: 10
Fighting: 18
Rock: 12
Ground: 23
Psychic: 14
Ghost: 16
Dragon: 17
Dark: 11
Steel: 9
Fairy: 16