Any documentary material, data or other writing made or received by the West Virginia development office or other public body, whose primary responsibility is economic development, for the purpose of furnishing assistance to a new or existing business shall be exempt from the provisions of article one, chapter twenty-nine-b of this code: Provided, That any agreement entered into or signed by the development office or public body which obligates public funds shall be subject to inspection and copying pursuant to the provisions of said article as of the date the agreement is entered into, signed or otherwise made public.