Context: The car also won the 1961 British Saloon Car Championship season, 1962 British Saloon Car Championship season, 1969 British Saloon Car Championship season, 1978 British Saloon Car Championship season and 1979 British Saloon Car Championship season, as well as the British Rally Championship in 1962, 1963 and 1970, the European Rally Championship in 1965 and 1966, and won the Finnish Rally Championship in 1965 and 1966. Minis also won the 1965 Lowood 4 Hour endurance race, and the final Finnish Grand Prix in 1963. The Cooper S also had some success in the European Touring Car Championship, winning in 1964 and 1968, the Guia Race of Macau (a 1-2-3 finish in 1965, a 1-2 finish in 1970 and a win in 1972), and the Australian Touring Car Championship, winning its class in 1962, 1963, 1964, 1966, 1967 and 1968. A further title was the 1971 Sun-7 Chesterfield Series. The Mini also enjoyed class wins at the 1963 Armstrong 500, repeating this feat every year until 1969 Hardie-Ferodo 500, and having class wins at the 1964, 1965 and 1971 Sandown 250, and Six Hour Le Mans in 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970 and 1972, as well as the 1971 Phillip Island 500K. The car also won the Welsh Sports and Saloon Car Championship in 1998. Mini Leyland came 4th place in the under-2-litre category in the 1966 Trans-Am season, 1967 Trans-Am season and 1969 Trans-Am seasons, improving to 3rd in 1970 Trans-Am season.

Question: How many class wins occurred from 1963-1968 for the Six Hour Le Mans?

Answer:
6