The first recorded El Niño that originated in the central Pacific and moved toward the east was in 1986. Recent Central Pacific El Niños happened in 1986-87, 1991-92, 1994-95, 2002-03, 2004-05 and 2009-10. Furthermore, there were "Modoki" events in 1957-59, 1963-64, 1965-66, 1968-70, 1977-78 and 1979-80. Some sources say that the El Niños of 2006-07 and 2014-16 were also Central Pacific El Niños.
Question: How many years separated the end of the first Central Pacific El Niño from the beginning of the second ever recorded one?
Answer: 4