The Group of Six (G6) was an unofficial forum which brought together the heads of the richest industrialized countries: France, Germany, Italy, Japan, the United Kingdom and the United States. This select few became the Group of Seven (G7) starting in 1976 when Canada joined. The Group of Eight was formed with the addition of Russia in 1997. In addition, the President of the European Commission has been formally included in summits since 1981. The summits were not meant to be linked formally with wider international institutions; and in fact, a mild rebellion against the stiff formality of other international meetings was a part of the genesis of cooperation between France's President Giscard d'Estaing and West Germany's Chancellor Helmut Schmidt as they conceived the initial summit of the Group of Six in 1975.