The article below shows that despite our relaxed gun control laws, our rates of violent crimes have decreased from 1996 - 2010. The FBI annual crime statistic report also shows these numbers to be accurate. These same numbers are used in the report Vell linked. The ABS rates are hard to come by, but the article refers to them.
http://www.fcsm.gov/12papers/Li_2012FCSM_I-B.pdf
First, you can
not look at a law in Australia and expect the same outcome here. Snopes said that and anyone who went through stats 101 will know that. We have been through these motions Humerox.