Salary growth

Hi guys!!

I was wondering how does the pay progress over time. Let's assume some cases:

1)Non competitive speciality (IM,Peds etc) in small cities.

2)Non competitive speciality (IM,Peds etc) in big cities.

3)Mid range competitive(general surgery, psych etc) in small cities.

4)Mid range competitive(general surgery, psych etc) in big cities.

Assume no private practice in any of the cases.

Also how would the pay change with a fellowship?