In what decade was Fleetwood Mac formed?

Explanation

Fleetwood Mac is a British-American blues rock band formed in 1967. In 1977, their album "Rumours" became the largest commercial success in the history of rock music so far, with more than 25 million LP's sold. The band split in 1982. They had a short comeback in 1987 before reuniting with the album "Say You Will" in 2003.