Japan signed the peace treaty with 49 nations in 1952 and concluded 54 bilateral agreements that included those with Burma (US$20 million 1954,1963), the Republic of Korea (US$300 million 1965), Indonesia (US$223.08 million 1958), the Philippines (525 million US dollars/52.94 billion yen 1967), Malaysia (25 million Malaysian dollars/2.94 billion Yen 1967), Thailand (5.4 billion Yen 1955), Micronesia (1969), Laos (1958), Cambodia (1959), Mongolia (1977), Spain ($5.5 million 1957), Switzerland, Netherlands ($10 million 1956), Sweden and Denmark. Payments of reparations started in 1955, lasted for 23 years and ended in 1977. For countries that renounced any reparations from Japan, it agreed to pay indemnity and/or grants in accordance with bilateral agreements. In the Joint Communiqué of the Government of Japan and the Government of the Peoples Republic of China (1972), Peoples Republic of China renounces its demand for war reparation from Japan. In the Soviet-Japanese Joint Declaration of 1956, the Soviet Union waived its rights to reparations from Japan, and both Japan and the Soviet Union waived all reparations claims arising from war. Additionally, Ceylon (now Sri Lanka), under President J. R. Jayewardene, declined war reparations from Japan.
Question: How many years apart was the Mongolia agreement from the Spain agreement?
Answer: 20