Which actor played James Bond only once, in 'On Her Majesty's Secret Service'?

Which actor played James Bond in 'Dr. No', the first Bond film? Which actor played James Bond the most times in the official Eon series, with seven films? Which actor played James Bond in 'Casino Royale' (2006)? Which actor played James Bond in 'GoldenEye' (1995)? What is the name of James Bond's boss, known by a single letter? In which year was 'Star Wars' (later titled 'A New Hope') released? In which year was 'Jaws' released? In which year was 'Titanic' released?