The percentage of newsprint used which is made from recycled-content newsprint shall be calculated in tons used on an annual basis and shall increase to:
(a) Thirty percent on and after January 1, 1994.
(b) Thirty-five percent on and after January 1, 1996.
(c) Forty percent on and after January 1, 1998.
(d) Fifty percent on and after January 1, 2000.
(Added by Stats. 1990, Ch. 35, Sec. 23. Effective March 30, 1990.)