All money derived from the licensing and regulation of private investigators shall be expended exclusively on the licensing and regulation of private investigators. If, at the end of any fiscal year, the money derived from the licensing of private investigators and not expended pursuant to this section is an amount which equals or is more than the money necessary for the regulation of private investigators for the next two fiscal years, license or other fees shall be reduced during the following fiscal year in an amount which will reduce any surplus money derived from the licensing of private investigators to an amount less than the money expended for the regulation of private investigators for the next two fiscal years.