In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Context: The right to marry a person of a different race was addressed in Loving v. Virginia, in which the Court said, in 1967, that its decision striking down anti-miscegenation laws could be justified either by substantive due process, or by the Equal Protection Clause. Link Information: Anti-miscegenation laws were first introduced in North America from the late seventeenth century onwards by several of the Thirteen Colonies, and subsequently by many US states and US territories and remained in force in many US states until 1967. Question: How many years after the Equal Protection Clause was created was it used to strike down anti-miscegenation laws?
Answer: 99