 Complete the following phrase:  Rodríguez Brothers Racetrack is a race track in Mexico City, Mexico, named for the famous Rodríguez brothers, Pedro and Ricardo. Built in a public park in 1962, the circuit hosted its first Formula One Grand Prix the same year, as a non-Championship race. The following year the Mexican Grand Prix became a full World Championship event. The circuit remained part of the F1 calendar through 1970, when spectator overcrowding caused unsafe conditions. When the track re-opened in 1986, the circuit boasted a new pit complex, as well as improved safety all around. The Mexican GP remained until 1992, when the circuit once again became too unsafe for the Formula One cars of the period and Mexico did not return until further upgrades were completed in 