The success of the Mexican GP has affectively increased interest from new sponsors from Mexico so in addition to the Carlos Slim money new Mexican Sponsors want to join the Force India team on an annual basis. These sponsors joined the team for the Mexican GP exclusively. So due to the positive impact of F1 in Mexicos LARGE Motor sport fans. They now opt to sponsor the Team during the whole season since even though they are only National Size Brands the attention of the National Audience on the season long racing merits the value of sponsorship during the entire year.
Force India is obviously very happy so together with Johnny Walker and Aston Martin the next 2 years should be interesting at Force India.