Numbers of course, are not the whole story. The US fleet is, by tonnage, far in excess of any competitor. The relatively strong allied fleets of Japan and South Korea are not included. The US still far outspends most of the rest of the world and most of the top ten navies of the world are our allies.
Still the decline of the Russian (Soviet) Navy and the continued growth of the Chinese Navy are clear. China’s rapidly improving quality including ships comparable to Aegis destroyers is not.
Source: Combat Fleets of the World here.