List of presidents who have been shot at: Andrew Jackson, Abraham Lincoln (killed), James Garfield (killed), William McKinley (killed), JFK (killed), Theodore Roosevelt, Ronald Regan, Richard Nixon (shot missed), Gerald Ford (gun malfunction. It didn't go off. A second separate attempt had the shot miss) and now Trump.
George W. Bush also had a grenade thrown towards him during a speech (it didn't explode), and a pipe bomb was sent to Obama (the secret service got to it first).
So that's 10 presidents who have been shot at, 4 who were killed, and at least 2 bombing attempts.