That should go down when Ant-Man and the wasp and Captain Marvel come out. Best case scenario is that they're in the 700-900 million range so that. A:IW2 can bring up the average per movie over 1 billion again.
Captain Marvel could do great.
They're going to play on the IW2 introduction with the past of Thanos, and you can expect lots of "First Marvel female superhero" articles...