(2) An amendment to the articles of incorporation that adds a greater quorum or voting requirement must meet the quorum requirement and be adopted by the vote and voting groups required to take action under the quorum and voting requirements then in effect. An amendment to the articles of incorporation that changes or deletes a greater quorum or voting requirement must meet the quorum requirement and be adopted by the vote and voting groups required to take action immediately prior to the change or deletion. [1987 c.52 §63; 1989 c.1040 §19]