How many people were executed during the Salem witch trials?

In February of 1692 in Salem Village, Massachusetts, two young girls suddenly started exhibiting strange behavior.

Two cousins, aged 9 and 11, began to scream, speak in strange tongues, throw things, and contort their bodies. Minister John Hale described the behavior as "beyond the power of epileptic fits or natural disease to effect."

Soon more girls were exhibiting the same affliction, all with no apparent medical cause — and then the accusations started flying. Over the next year, one of the most intense and remarkable moments of hysteria in history played out, ultimately having a major influence on what would become the American legal system.

You've heard about the trials and the executions, surely, but do you know how many of those supposed witches were actually put to death during this period?