How big is the Roman Catholic church on the western coast of Norway?

Allegedly, my great, great grandmother, an immigrant from Norway was a strict Roman Catholic (and married a luthern which is my great, great grandfather, but only after he converted to the Holy Faith). I cannot find any trace of Catholicism in modern day Norway (the reformation took place about 300 years before Kristina Andersen was born). It(Catholicism) only makes up a small, small percentage, and that is from Polish and other immigrants who come from countries that are primarily Roman Catholic. So, How big is the Roman Catholic church on the western coast of Norway?