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: WQXL switched to country music in the summer of 1966 Link Information: WNOK 1230 AM signed on January 1, 1947 Question: How many years had WNOK been operating when WQXL switched to country music?
Answer: 19