The Series IIA is considered by many the most hardy Series model constructed. It is also the type of classic Land Rover that features strongly in the general public's perception of the Land Rover, from its many appearances in popular films and television documentaries set in Africa throughout the 1960s, such as Born Free. In February 1968, just a few months after its manufacturer had been subsumed, under government pressure, into the Leyland Motor Corporation, the Land Rover celebrated its twentieth birthday, with total production to date just short of 600,000, of which more than 70% had been exported. Certainly it was whilst the Series IIA was in production that sales of utility Land Rovers reached their peak, in 1969-70, when sales of over 60,000 Land Rovers a year were recorded. As well as record sales, the Land Rover dominated many world markets- in Australia in the 1960s Land Rover held 90% of the 4×4 market. This figure was repeated in many countries in Africa and the Middle East.