Well, that's really not something you have control over. Your body is going to put on weight (lean mass) based on:
Training
Nutrition
Rest/Recovery
Genetic predisposition
Drugs - which I hope you're not considering as of yet
Most novices will be lucky to put on a few quality pounds of muscle per year. That's why I always laugh when guys talk about how they gained "30 solid pounds" during their bulk. Yea ... 29lbs of fat, 1lb of muscle. Then they'll lose 5lbs of muscle trying to lose the fat. But, I digress.
Just continue to train and eat properly, don't be overly concerned with 'how much' weight you're gaining; be concerned with the fact you are progressing. If you maintain leanness and are gaining weight, then you're doing something right.