Question: What years did the driver of the McLaren MP4/13 win the Formula One World Champion?

Related documents: [0]  [DOC] Mika Pauli Häkkinen (   ; born 28 September 1968), nicknamed ""the Flying Finn"", is a Finnish former professional racing driver. He was the 1998 and 1999 Formula One World Champion, driving for McLaren and has been ranked among the greatest Formula One drivers in various motorsport polls. Häkkinen currently works in driver management and is a brand ambassador for various companies. [END] 
[1]  [DOC] The McLaren MP4/13 was a racing car that the McLaren Formula One team used during the 1998 Formula 1 season. Driven by Mika Häkkinen and David Coulthard, who were retained from the previous season, the car proved to be the dominant car of the season, taking Häkkinen to his first Drivers' Championship and securing McLaren's first constructor's title since 1991. [END]  
Answer: 1998 and 1999
1998 and 1999