Indianapolis has oriented itself around government (a byproduct of its state capital function) and industry, particularly manufacturing. Over the late decades of the 20th century, the city's Unigov began a long process to revitalize the downtown area. Today, Indianapolis has a much more diversified economy, contributing to the fields of education, health care, and finance. Tourism is also a vital part of the economy of Indianapolis, with the city playing host to numerous conventions and sporting events. Of these, perhaps the most well known are the annual Indianapolis 500, Brickyard 400, and NHRA U.S. Nationals. Other major sporting events include the Men's and Women's NCAA basketball tournaments. Indianapolis also hosted the Pan American Games in 1987 and Super Bowl XLVI in 2012.