19-19-301. City's contribution to fund. Each city, other than one of the first or second class, that has a police retirement fund and that did not elect to join the statewide police reserve fund provided for in Chapter 335, Laws of 1974, and has not elected to participate in the plan under 19-9-207 shall deposit in its fund monthly an amount equal to 11% of the total salaries for the preceding month paid to active police officers of the city, exclusive of overtime and payments in lieu of sick leave and annual leave. If the demand against a city for deposits in its fund cannot be met, the city, subject to 15-10-420, may impose an additional levy in an amount that is sufficient to meet the demand.