All measures proposed by initiative shall be presented by petition. The petition shall be signed by not less than five percent of the qualified electors of the state.

Source: SDC 1939, § 55.0401; SL 1957, ch 278, § 1; SL 1976, ch 105, § 76; SL 1978, ch 19, § 1; SL 1989, ch 23, § 1.