Which of the following is the national level system that provides annual national and state level reliable estimates of feility?

General Feility Rate (GFR):It is the "number of live bihs per 1000 women in the reproductive age-group (15-44 or 49 years) in a given year".GFR = in the same area in same year] x 1000General feility rate is a better measure of feility than the crude bih rate because the denominator is restricted to the number of women in the child-bearing age, rather than the whole population. The major weakness of this rate is that not all women in the denominator are exposed to the risk of childbih. Ref: Park; 23rd ed; Pg 488