Each consumer of newsprint within the State shall, on or before March 1 of each year, certify to the Agency the amount in tons of every type of newsprint used by the consumer of newsprint the previous year and the percentage of recycled fibers present in each type of newsprint, so that the Agency can calculate the recycled fiber usage for that consumer of newsprint. All Illinois consumers of newsprint shall submit the first consumer usage certificate by March 1, 1992, for the calendar year 1991. Only consumers of newsprint who provide timely usage certificates shall receive credit for recycled fiber usage.