Jim, I don't understand the second and third columns of data. First is "Total Murders." That I get.
Then you have "Non-Firearm Minus Long Guns" and "Knives Minus Long Guns."
Farther over, you have a column for "Gun" (meaning, I assume, all firearms) murders per 100k population. Then you have one for "rifle." But "long guns" also includes shotguns. It would seem to me that, if you're going to break down total gun murders, it should be broken down into Handgun, Rifle, Shotgun, and Unidentified Firearm.
If you want to PM me your e-mail address, I'll take a shot at doing some cleaning up of the format and send my result back to you.