The first Oktoberfest was held as a horse race celebrating the wedding of Crown Prince Ludwig of Bavaria to Princess Therese von Saxony-Hildburghausen. In the years that followed, the race was combined with the state agricultural fair, and food and drink were offered. Since that time the 16-day festival has become, above all else, a celebration of German beer, drawing more than five million attendees annually. How many millions of liters of beer did Oktoberfest attendees consume in 2007? Discuss