How the Box Office has evolved in the Star Wars franchise since 1977
With the exception of Ep.II, Star Wars movies have been always been the top one in the yearly box office since 1977. This is how big were their box office in comparison with the second highest box office of the same year (except for episode 2, which is compared with the first one).
Star Wars 2.72x
The Empire Strikes Back 2.02x
Return of the Jedi 2.33x
The Phantom Menace 1.47x
Attack of the Clones 0.74x
Revenge of the Sith 1.30x
The Force Awakens 1.43x
Rogue One 1.09x
The Last Jedi 1.07x
It doesn't look good for episode 9...