How many new circuits have played host to the final round of the F1 season?

Abu Dhabi is a new circuit on the 2009 F1 calendar, and it is playing host to the season finale.





I know of two other occasions when this has happened:


- 1984, Estoril, Portugal


- 1985, Adelaide, Australia





How many other times has this happened since 1950?





Thanks!!|||1950 - Monza, Italy





1951 - Pedralbes, Spain





1958 - Ain Diab, Morocco





1959 - Sebring, USA





1960 - Riverside, USA





1961 - Watkins Glen, USA





1962 - East London, South Africa





1976 - Fuji, Japan





1978 - Montreal, Canada





1981 - Las Vegas, USA





1984 - Estoril, Portugal





1985 - Adelaide, Australia





2009 - Yas Marina, Abu Dhabi





So that makes 13 times since 1950.