There shall be levied each year in each county of the state a tax of not to exceed six (6) mills on the dollar of the assessed valuation of the property in each county for the support and maintenance of the public schools.� This tax shall be collected by the county treasurer and disbursed among the school districts within the county as the legislature shall provide.� The legislature may authorize boards of trustees of school districts to levy a special tax on the property of the district.� The legislature may also provide for the distribution among one (1) or more school districts of any revenue from the special school district property tax in excess of a state average yield, which shall be calculated each year, per average daily membership.