Extract the years in which Ayrton Senna da Silva won the Formula One World Drivers' Championship and list them using bullets.

Context: Ayrton Senna da Silva was a Brazilian racing driver who won the Formula One World Drivers' Championship in 1988, 1990, and 1991. Senna is one of three Formula One drivers from Brazil to win the World Championship and won 41 Grands Prix and 65 pole positions, with the latter being the record until 2006. He died in an accident while leading the 1994 San Marino Grand Prix, driving for the Williams team.

Answer: - 1988
- 1990 
- 1991