Upon the adoption of such proposition the county board shall cause an annual tax of not to exceed .05% of value, as equalized or assessed by the Department of Revenue, of all taxable property of such county to be levied upon all the taxable property in such county for county fair purposes therein. Such tax shall be in addition to all other taxes authorized by law to be levied and collected in such county and shall be in addition to the maximum of taxes authorized by law for county purposes. The foregoing limitations upon tax rates may be increased or decreased according to the referendum provisions of the General Revenue Law of Illinois.
55 ILCS 5/6-21004