https://nsidc.org/arcticseaicenews/

"Overall, the amount of multiyear ice remaining at the end of summer is considerably lower than it used to be during
 the 1980s and 1990s. Now multiyear ice covers 2 million square kilometers (772,000 square miles) or less of the
 Arctic Ocean. The oldest ice, which has survived at least four melt seasons, used to cover nearly 1.5 million square
 kilometers (579,000 square miles). In 2018, this old ice covered only 94,000 square kilometers (36,0000 square miles)
 at the September minimum."