It's simple, crime follows poverty around like a lap dog. The more people that can't make ends meet, the more people there are that lash out against there neighbors. It's not just human nature, it's the basic law of the jungle.
I'm willing to bet that the chart above correlates nicely with the percentage of people living below the poverty line. As the rich get richer, the money comes from the poor... and the poor start fighting over what's left.
I'm not a socialist, I think that most people can do just fine on their own w/o a government making decisions for them. But I'm realistic enough to realize that many people are born into a cycle of poverty and lack of education that makes it impossible for them to get out of the trappings of an open economy. I've got no problem taking from the top 1% and giving to the bottom 10%.
Edit: here's a poverty graph over the same years as the crime graph above.
The correlation is pretty clear (assuming you ignore the vast improvement in poverty due to the ending of segregation), though it's kinda interesting that crime seems to precede the poverty curve by a year or two. Perhaps it's the crime that causes poverty? Or just perhaps the crime is a symptom of the problem that shows up before people are driven below the poverty threshold?