This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: In 1954, under the "Charter for the Kingdom of the Netherlands", the Netherlands, Suriname and the Netherlands Antilles became a composite kingdom. The former colonies were granted autonomy, save for certain matters including defense, foreign affairs and citizenship, which were the responsibility of the Realm. In 1969, unrest in Curacao led to Dutch marines being sent to quell rioting. In 1973, negotiations started in Suriname for independence, and full independence was granted in 1975, with 60,000 emigrants taking the opportunity of moving to the Netherlands. In 1986, Aruba was allowed to secede from the Netherlands Antilles federation, and was pressured by the Netherlands to move to independence within ten years. However, in 1994, it was agreed that its status as a Realm in its own right could continue. On October 10, 2010, the Netherlands Antilles were dissolved. Effective on that date, Curacao and Sint Maarten acceded to the same country status within the Kingdom that Aruba already enjoyed. The islands of Bonaire, Sint Eustatius and Saba were granted a status similar to Dutch municipalities, and are now sometimes referred to as the Caribbean Netherlands.
Question: How many years was it between Suriname's independence and Aruba's seceding frmo the Netherlands Antilles?
Answer type: Number
11.