How many times Elliot is wounded?¿

This is what I got form wikipedia:

Stabler has a close call in the season 7 episode "Raw" when he is shot in the arm by a white supremacist during a trial. He makes a full recovery.

In the season 8 episode "Informed", Stabler is injured in an explosion involving dynamite, but recovers from his injures.

Stabler is stabbed with a pen in the chest, during the season 8 episode "Cage".

He sustains a deep cut to the hand while searching a car garage in the season 2 episode "Victims."

In the season 8 episode "Loophole", Stabler is injured after Cupid (Bill Goldberg) throws him out the window, severely damaging Stabler's arm in the process.

In season nine's episode "Blinded" he is temporarily blinded by a schizophrenic rapist (Arye Gross) who throws him into a car window. The injury was not permanent and he returns to duty within a week.

In "Wildlife," during the tenth season, Stabler goes undercover and is seriously wounded.

Hope it helps!