The economic boom from World War I had dissipated by 1922 and 23% of Northern Ireland was now unemployed. No one had predicted the economic slump and, while some blamed the Unionist government, this issue is now believed to have resulted from Westminster not giving Northern Ireland enough power over their own financial policy. There were similar effects being felt in Britain as the Great War had changed the nature of international trade. The 1929 Stock Market Crash in New York had wide-reaching effects around the world in places like Northern Ireland. Economic interests in the province, particularly large industries like shipbuilding, were hit hard. In Belfast, Harland & Wolff did not launch a single ship between December 1931 to May 1934. By January 1933, the volume of international trade was only one-third of what it had been before the Crash. Workman, Clark and Company shipyard closed down permanently in 1935.