International pressure led to a ceasefire, and by then 37% of the island had been taken over by the Turks and 180,000 Greek Cypriots had been evicted from their homes in the north. At the same time, around 50,000 Turkish Cypriots moved to the areas under the control of the Turkish Forces and settled in the properties of the displaced Greek Cypriots. Among a variety of sanctions against Turkey, in mid-1975 the US Congress imposed an arms embargo on Turkey for using American-supplied equipment during the Turkish invasion of Cyprus in 1974. There are 1,534 Greek Cypriots and 502 Turkish Cypriots missing as a result of the fighting.
In what year did the US impose an arms embargo on Turkey? (If the question is unanswerable, say "unanswerable")
1975