Question: The 1964 Mediterranean Grand Prix was won by a Swiss driver born in what year?

Context paragraphs:
Frank Gardner (racing driver): Frank Gardner (1 October 1931 – 29 August 2009) was a racing driver from Australia.  Born in Sydney, he was best known as a Touring car racing and Sports car racing driver but he was also a top flight open wheeler driver.  He was European F5000 champion, and participated in nine World Championship Formula One Grands Prix, debuting on 11 July 1964.  He scored no championship points.  Gardner also participated in numerous non-Championship Formula One races and his results included a third placing at the 1965 Mediterranean Grand Prix at the Autodromo di Pergusa in Sicily, fourth in the 1965 Race of Champions at Brands Hatch and third in the 1971 International Gold Cup at Oulton Park.  He participated each year in the open wheeler Tasman Series held in New Zealand and Australia during the European winter, and shared the grids with the likes of Jim Clark, Graham Hill and Jochen Rindt.

1964 Mediterranean Grand Prix: The 3rd Mediterranean Grand Prix was a motor race, run to Formula One rules, held on 16 August 1964 at the Autodromo di Pergusa, Sicily.  The race was run over 60 laps of the circuit, and was won by Swiss driver Jo Siffert in a Brabham BT11.

1966 South African Grand Prix: The 1966 South African Grand Prix, formally titled the 12th International RAC Grand Prix of South Africa (Afrikaans: "12de Internasionale RAC Grand Prix van Suid-Afrika"), was a non-championship Formula One motor race held on 1 January 1966 at Prince George Circuit, East London, South Africa.  The race, run over 60 laps of the circuit, was won by British driver Mike Spence in a works Lotus-Climax.  Spence won by two laps from the private Brabham-BRM of Swiss driver Jo Siffert, with fellow Briton Peter Arundell third in the other works Lotus-Climax.

1963 Mediterranean Grand Prix: The 1963 Mediterranean Grand Prix was a motor race, run to Formula One rules, held on 18 August 1963 at the Autodromo di Pergusa, Sicily.  The second running of the Mediterranean Grand Prix, the race was run over 60 laps of the circuit, and was dominated by British driver John Surtees in a Ferrari 156.

Ray Reed: Raymond William Reed (30 April 1932 – 8 May 1970) was a Rhodesian racing driver born in Gwelo, Southern Rhodesia.  He was entered in the 1965 South African Grand Prix in his self-built RE-Alfa Romeo, but did not take part and had earlier participated in the non-championship 1964 Rand Grand Prix.  Reed was killed along with his three children in an aircraft accident on 8 May 1970 near Nottingham Road, Natal in South Africa.  He had been deemed to be flying in weather conditions under which he was not qualified or legally permitted to fly.

Mediterranean Grand Prix: The Mediterranean Grand Prix was a non-Championship motor race, held at the Autodromo di Pergusa, in Sicily, Italy.  The first event, run to Formula One rules, took place in 1962.  The last Formula One event took place in 1965 before the race switched to Formula Two rules.  In 1985, Formula Two was replaced by Formula 3000 and the Mediterranean Grand Prix remained on the calendar.

1947 Reims Grand Prix: The XVI (16th) Grand Prix de Reims (also known as the I Grand Prix de Reims) was held under Grand Prix regulations on July 6, 1947, at the Reims-Gueux circuit near Reims in north-eastern France.  The race was run over 51 laps on a 7.816 km circuit of public roads and was won by Swiss driver Christian Kautz in a Maserati 4CL.

1974 German Grand Prix: The 1974 German Grand Prix was a Formula One motor race held at the Nürburgring on 4 August 1974.  It was race 11 of 15 in both the 1974 World Championship of Drivers and the 1974 International Cup for Formula One Manufacturers.  It was the 36th German Grand Prix and the 33rd to be held at the Nürburgring complex of circuits.  The race was won by Swiss driver Clay Regazzoni driving a Ferrari 312B3.  Regazzoni led every lap on the way to his second Grand Prix victory, some four years after his debut victory at the 1970 Italian Grand Prix.  South African driver Jody Scheckter was second driving a Tyrrell 007 ahead of Argentine driver Carlos Reutemann (Brabham BT44).

1965 Mediterranean Grand Prix: The 4th Mediterranean Grand Prix was a motor race, run to Formula One rules, held on 15 August 1965 at the Autodromo di Pergusa, Sicily.  The race was run over 60 laps of the circuit, and was won for the second year in succession by Swiss driver Jo Siffert in a Brabham BT11.

Jo Siffert: Joseph Siffert (7 July 1936 – 24 October 1971) was a Swiss racing driver.

Supporting paragraphs: 1964 Mediterranean Grand Prix Jo Siffert
Answer: 1936