Why is there difference in fps and time to render a frame in statistics window and profiler?

I try to optimize my game. When I look at statistics window in Unity editor, it says that it takes 21.4 ms to render one frame.

But if I go to Unity profiler, it says that only GPU needs 144 ms to process graphics.

Exactly the same applies to FPS. Why is there such a difference? I thought that time taken by GPU and CPU should approximately equal overall time to process one frame?