1 17 U.S.T. 1270,575 U.N.T.S.159. The Convention was opened for signature on March 18, 1965. In accordance with its Article 68(2), the Convention entered into force on October 14, 1966, thirty days after the deposit of the twentieth instrument of ratification. As of October 30,1987, the Convention had been signed by 97 States, 89 of whom had ratified it. For the background and negotiating history of the Convention, see Report of the Executive Directors accompanying the text of the Convention, reproduced in Doc. ICSID/2 at paras. 6-8 [hereinafter cited as Report]; Broches, The Convention on the Settlement ofInvestment Disputes Between States and Nationals of Other States, 136 Recueil des Cours 331, 342-48 (1972) and Development of International Law by the International Bank for Reconstruction and Development, 1965 ASIL Proc.33. For the legislative history, see ICSID, Convention on the Settlement ofInvestment Disputes Between States and Nationals of Other StatesDocuments Concerning the Origin and the Formulation of the Convention (1970) [hereinafter cited as History].