Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Season | Driver | Team | Engine | Poles | Wins | Podiums | Points | Margin of defeat |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1950.0 | Juan Manuel Fangio | Alfa Romeo | Alfa Romeo | 4.0 | 3.0 | 3.0 | 27 | 3 |
| 1951.0 | Alberto Ascari | Ferrari | Ferrari | 2.0 | 2.0 | 3.0 | 25 | 6 |
| 1952.0 | Giuseppe Farina | Ferrari | Ferrari | 2.0 | 0.0 | 4.0 | 24 | 12 |
| 1953.0 | Juan Manuel Fangio | Maserati | Maserati | 1.0 | 1.0 | 4.0 | 28 | 6.5 |
| 1954.0 | José Froilán González | Ferrari | Ferrari | 1.0 | 1.0 | 4.0 | 25.14 | 16.86 |
| 1955.0 | Stirling Moss | Mercedes | Mercedes | 1.0 | 1.0 | 3.0 | 23 | 17 |
| 1956.0 | Stirling Moss | Maserati | Maserati | 1.0 | 2.0 | 3.0 | 27 | 3 |
| 1957.0 | Stirling Moss | Maserati Vanwall | Maserati Vanwall | 1.0 | 3.0 | 3.0 | 25 | 15 |
| 1958.0 | Stirling Moss | Cooper Vanwall | Climax Vanwall | 3.0 | 4.0 | 5.0 | 41 | 1 |
| 1959.0 | Tony Brooks | Ferrari | Ferrari | 2.0 | 2.0 | 4.0 | 27 | 4 |
| 1960.0 | Bruce McLaren | Cooper | Climax | 0.0 | 1.0 | 6.0 | 34 | 9 |
| 1961.0 | Wolfgang von Trips † | Ferrari | Ferrari | 1.0 | 2.0 | 4.0 | 33 | 1 |
| 1962.0 | Jim Clark | Lotus | Climax | 5.0 | 3.0 | 3.0 | 30 | 12 |
| 1963.0 | Graham Hill | BRM | BRM | 2.0 | 2.0 | 5.0 | 29 | 25 |
| 1964.0 | Graham Hill | BRM | BRM | 1.0 | 2.0 | 5.0 | 39 | 1 |
| 1965.0 | Graham Hill | BRM | BRM | 4.0 | 2.0 | 6.0 | 40 | 14 |
| 1966.0 | John Surtees | Ferrari Cooper | Ferrari Maserati | 2.0 | 2.0 | 4.0 | 28 | 14 |
| 1967.0 | Jack Brabham | Brabham | Repco | 2.0 | 2.0 | 6.0 | 46 | 5 |
| 1968.0 | Jackie Stewart | Matra | Ford | 0.0 | 3.0 | 4.0 | 36 | 12 |
| 1969.0 | Jacky Ickx | Brabham | Ford | 2.0 | 2.0 | 5.0 | 37 | 26 |
| 1970.0 | Jacky Ickx | Ferrari | Ferrari | 4.0 | 3.0 | 5.0 | 40 | 5 |
| 1971.0 | Ronnie Peterson | March | Ford | 0.0 | 0.0 | 5.0 | 33 | 29 |
| 1972.0 | Jackie Stewart | Tyrrell | Ford | 2.0 | 4.0 | 5.0 | 45 | 16 |
| 1973.0 | Emerson Fittipaldi | Lotus | Ford | 1.0 | 3.0 | 8.0 | 55 | 16 |
| 1974.0 | Clay Regazzoni | Ferrari | Ferrari | 1.0 | 1.0 | 7.0 | 52 | 3 |
| 1975.0 | Emerson Fittipaldi | McLaren | Ford | 0.0 | 2.0 | 6.0 | 45 | 19.5 |
| 1976.0 | Niki Lauda | Ferrari | Ferrari | 3.0 | 5.0 | 9.0 | 68 | 1 |
| 1977.0 | Jody Scheckter | Wolf | Ford | 1.0 | 3.0 | 9.0 | 55 | 17 |
| 1978.0 | Ronnie Peterson † | Lotus | Ford | 3.0 | 2.0 | 7.0 | 51 | 14 |
| 1979.0 | Gilles Villeneuve | Ferrari | Ferrari | 1.0 | 3.0 | 7.0 | 47 | 4 |
| 1980.0 | Nelson Piquet | Brabham | Ford | 2.0 | 3.0 | 6.0 | 54 | 13 |
| 1981.0 | Carlos Reutemann | Williams | Ford | 2.0 | 2.0 | 7.0 | 49 | 1 |
| 1982.0 | Didier Pironi | Ferrari | Ferrari | 2.0 | 2.0 | 6.0 | 39 | 5 |
| 1983.0 | Alain Prost | Renault | Renault | 3.0 | 4.0 | 7.0 | 57 | 2 |
| 1984.0 | Alain Prost | McLaren | TAG | 3.0 | 7.0 | 9.0 | 71.5 | 0.5 |
| 1985.0 | Michele Alboreto | Ferrari | Ferrari | 1.0 | 2.0 | 8.0 | 53 | 20 |
| 1986.0 | Nigel Mansell | Williams | Honda | 2.0 | 5.0 | 9.0 | 70 | 2 |
| 1987.0 | Nigel Mansell | Williams | Honda | 8.0 | 6.0 | 7.0 | 61 | 15 |
| 1988.0 | Alain Prost | McLaren | Honda | 2.0 | 7.0 | 14.0 | 87 | 3 |
| 1989.0 | Ayrton Senna | McLaren | Honda | 13.0 | 6.0 | 7.0 | 60 | 16 |
| 1990.0 | Alain Prost | Ferrari | Ferrari | 0.0 | 5.0 | 9.0 | 71 | 7 |
| 1991.0 | Nigel Mansell | Williams | Renault | 2.0 | 5.0 | 9.0 | 72 | 24 |
| 1992.0 | Riccardo Patrese | Williams | Renault | 1.0 | 1.0 | 9.0 | 56 | 52 |
| 1993.0 | Ayrton Senna | McLaren | Ford | 1.0 | 5.0 | 9.0 | 73 | 26 |
| 1994.0 | Damon Hill | Williams | Renault | 2.0 | 6.0 | 11.0 | 91 | 1 |
| 1995.0 | Damon Hill | Williams | Renault | 7.0 | 4.0 | 9.0 | 69 | 33 |
| 1996.0 | Jacques Villeneuve | Williams | Renault | 3.0 | 4.0 | 11.0 | 78 | 19 |
| 1997.0 | Heinz-Harald Frentzen * | Williams | Renault | 1.0 | 1.0 | 7.0 | 42 | 39 |
| 1998.0 | Michael Schumacher | Ferrari | Ferrari | 3.0 | 6.0 | 11.0 | 86 | 14 |
| 1999.0 | Eddie Irvine | Ferrari | Ferrari | 0.0 | 4.0 | 9.0 | 74 | 2 |
| 2000.0 | Mika Häkkinen | McLaren | Mercedes | 5.0 | 4.0 | 11.0 | 89 | 19 |
| 2001.0 | David Coulthard | McLaren | Mercedes | 2.0 | 2.0 | 10.0 | 65 | 58 |
| 2002.0 | Rubens Barrichello | Ferrari | Ferrari | 3.0 | 4.0 | 10.0 | 77 | 67 |
| 2003.0 | Kimi Räikkönen | McLaren | Mercedes | 2.0 | 1.0 | 10.0 | 91 | 2 |
| 2004.0 | Rubens Barrichello | Ferrari | Ferrari | 4.0 | 2.0 | 14.0 | 114 | 34 |
| 2005.0 | Kimi Räikkönen | McLaren | Mercedes | 6.0 | 7.0 | 12.0 | 112 | 21 |
| 2006.0 | Michael Schumacher | Ferrari | Ferrari | 4.0 | 7.0 | 12.0 | 121 | 13 |
| 2007.0 | Lewis Hamilton | McLaren | Mercedes | 6.0 | 4.0 | 12.0 | 109 | 1 |
| 2008.0 | Felipe Massa | Ferrari | Ferrari | 6.0 | 6.0 | 10.0 | 97 | 1 |
| 2009.0 | Sebastian Vettel | Red Bull | Renault | 4.0 | 4.0 | 8.0 | 84 | 11 |
| 2010.0 | Fernando Alonso | Ferrari | Ferrari | 2.0 | 5.0 | 10.0 | 252 | 4 |
| 2011.0 | Jenson Button | McLaren | Mercedes | 0.0 | 3.0 | 12.0 | 270 | 122 |
Question:
How many seasons was clay regazzoni the driver?
Answer:
1.0