The NANPA gathers forecast and utilization information to monitor and project exhaust in individual NPAs/area codes as well as in the NANP overall. This semi-annual report includes number utilization information as well as a five-year forecast of demand by year. Pooling carriers report at the thousands-block level per rate center. Non-pooling carriers report at the Central Office Code level per rate center. For more detailed information, see the NRUF Reporting Guidelines.