Each page of the petition which contains the signature of one or more registered voters shall show thereon the affidavit of the circulator in the following form:
The undersigned circulator of the above petition hereby declares under penalty of perjury that the circulator of this petition was over the age of 18 years, and that the signatures hereon are the signatures of the persons named and were signed in the presence of the circulator.
(Added by Stats. 1973, Ch. 643.)