After the next and every subsequent decennial census of the United States, the Senate districts and Assembly districts shall be established, and the senators and members of the General Assembly shall be apportioned among them, by an Apportionment Commission consisting of ten members, five to be appointed by the chairman of the State committee of each of the two political parties whose candidates for Governor receive the largest number of votes at the most recent gubernatorial election. Each State chairman, in making such appointments, shall give due consideration to the representation of the various geographical areas of the State. Appointments to the Commission shall be made on or before November 15 of the year in which such census is taken and shall be certified by the Secretary of State on or before December 1 of that year. The Commission, by a majority of the whole number of its members, shall certify the establishment of Senate and Assembly districts and the apportionment of senators and members of the General Assembly to the Secretary of State within one month of the receipt by the Governor of the official decennial census of the United States for New Jersey, or on or before February 1 of the year following the year in which the census is taken, whichever date is later.