You're not reading it wrong. That's actually a low value for the black share of murders; it's often above 50%.

The per capita rate of murder commission for blacks is about 8 times the general rate. It's true in the US, with its legacy of slavery, and also in England, with its equally bad legacy of slavery.

Or something.

EDIT: Actually, you are reading it wrong. That's 3,299 murders of whites, not 3,299 murders by whites.

The table shows 2,948 murders committed by whites ("Race of offender"), vs 3,218 murders committed by blacks.