Figures released by the European carmakers' association ACEA show that the Japanese carmakers' share of the West European passenger car market surged to 13.1% in the month of October - a figure which compares to 11% in October last year. The Japanese makers' sales increased to 154,136 units in October, a whopping 18.5% gain on the same month last year, prompting worries that European makers could face Detroit-style market share decline in Europe.