Is the size of the Pacific Ocean increasing or decreasing?

I learned in science that the Pacific Ocean is either increasing or decreasing in size by a couple of inches of year. Which one is it?
I didn't mean the water level but rather the plates by san francisco are moving either toward or away from the pacific making it larger or smaller

since water levels are rising i would guess it's getting larger.

increasing

global warming has caused a large amount of land masses in cold areas like the Alaska and Antarctica to melt so I believe that the water levels are most likely rising.

**Edit:

David W. (the guy two down from me) has it right.

it is increasing, because the solid ice melting down due to global warming!

Decreasing, as the North American continental plate moves westward and the Pacific plate subducts beneath. Meanwhile, the Atlantic ocean is getting wider as the North American plate is moving away from the Eurasian plate as ocean crust is being formed along the mid-continent rift.