2. Vehicle populationThe number of

2. Vehicle population
The number of vehicles used as denominator during the settlement month is defined for convenience as the mean monthly number of registered vehicles. The mean number of registered vehicles is obtained by going back by MIS months (or latest N LO months).
For example, the vehicle population for 99/8 settlement month and 3 MIS months is obtained as:

(No. of registered vehicles in 99/8 of vehicles produced from 99/5 through 99/7)/3
Similarly, the vehicle population for 99/8 settlement month and 6 MIS months is obtained as:
(No. of registered vehicles in 99/8 of vehicles produced from 99/2 through 99/7)/6