More than 1000 shots fired in happiness in Birmingham, AL

One of the things I loved about the two years I lived in Birmingham, AL: Being in a place where people openly and un-ironically fired guns into the air in order to celebrate things. This was something new to me, despite being raised a good country family with high levels of gun ownership. But that was in Kansas. Viva la difference, southern US! For instance, on the 4th of July, 2012, the Birmingham police recorded 1,098 incidents of gunfire (they have a detection system that's able to distinguish between gunshots and fireworks). In 2011, there were only 75 gunshots recorded. In 2010, 495. Which leads me to wonder: Is this random, or is there some factor leading to an increase in celebratory gunfire over the last three years? What social and economic factors affect the number of bullets people are willing to pump into the air?(Via Stan Diel) Maggie