The number of Grand Prix races held at each season change over time. 1950 The first season consists of 7 sessions and growing all the time. Since 1980 the number of sessions last race in 16 or 17 series and 19 series later reached in 2005.
Six of the seven race series first season in Europe, leaving the series Indianapolis as the only races held outside Europe. F1 Competition then gradually extended to non-European countries. Argentina became the only country in South America that organizes grand prix in 1953 Morocco became the first African country to host F1 race in 1958 Following Asia (Japan in 1976) and Oceania (Australia 1985). Series races are now spread across several countries in Europe, Asia, Oceania, North America and South America.
Generally, each state to host a grand prix once in every season that carries the name of the country to the international stage. With the exception of Germany which held two racing series each season. One of them is the Grand Prix of Europe.
The circuit used for the race can be different from one season to the next. For example the British Grand Prix held each year since 1950 have regularly alternated between Brands Hatch and Silverstone starting in 1963 to 1986 The only races that exist in every season is the Italian Grand Prix. Italian Serie always held in Monza, with one exception in 1980 where the series was held at Imola (which is now a circuit of the Grand Prix of San Marino).
One of the latest is a series of races held in Bahrain which became the organization of the first F1 race in the Middle East.