There were 19 F1 races in 2013.
Formula One races will be held at different circuits depending on the country and contract held.
Counting from the start of the first Formula One season in 1950, and including the 12 races that have been run in the 2013 season as of the time of this answer, there have been a total of 890 Formula One races.
Micheal Schumacher has won the most Formula One races with 91 victories and 7 chapionship titles. He is the best driver of all-time.
Nigel Mainsell won 31 races, and was champion in 1992
Juan Pablo Montoya has two Nascar Cup Series wins and one Nationwide Series win during his career. He also won seven Formula One races.
He was the 7 time world champion in formula one and out of 250 races(249 starts) he has had 91 wins.
In 2010 and in 2011 there was 19 races in the Formula One World Championship. Next year there will be 20 races which is the maximum amount that they want.
An attempt to summarize what is listed on Forix gives the result 849. Many of these have driven less than 5 races in total.
Sir Jackie Stewart
Because Porsche wants its race cars to look like their street cars. It costs too much to run Formula 1 and Porsche never did well in it. According to Wikipedia, cars made by Porsche or engined by Porsche have won over 28,000 races in all forms of motorsport. Of those 28,000 races, only two of them were Formula 1 races - and one of those was a non-points race.
The year that the Renault R31 was designed for Formula One Racing was 2007. It became a very popular design that used in many different races and worked very well.