Is there a problem of orlah with grapefruits from Israel sold in Chutz La’aretz with no hechsher

There are different percentages of orlah fruits on the market each season. According to HaRav Elyashiv זצ"ל, if the total percentage is less than 4%, one can assume it’s not from orlah. Note that the Beis Midrash publicizes the percentage of orlah of the fruits on the market, on a monthly basis. In any case, one needs to separate terumos and maasros from the fruit.