These developments eventually spurred Cardiff into action, with the opening of the Roath Dock in 1887 and the Queen Alexandra Dock in 1907. Coal exports from the South Wales Coalfield via Cardiff totalled nearly 9 million tons per annum, much of it exported in the holds of locally owned tramp steamers. The wealthier residents were able to move away to the new Cardiff suburbs. Butetown (particularly the area around Loudoun Square) became crowded, as families took in lodgers and split up the three-storey houses to help pay the rents. Tiger Bay had a reputation as a tough and dangerous area; but locals who lived and stayed in the area describe a far friendlier place. Merchant seamen arrived in Cardiff from all over the world, only staying for as long as it took to discharge and reload their ships. Consequently, it has been said that the area became the red-light district of Cardiff, and many murders and lesser crimes went unsolved and unpunished, as the perpetrators had sailed away. In reality the primary brothels streets, and the primary red light area, were Charlotte Street and Whitmore Lane, both of which were outside Tiger Bay. They were demolished, and the site is now the Marriott Hotel car park. By 1932, in the depths of the Great Depression which followed the 1926 United Kingdom general strike, coal exports had fallen to below 5 million tons, and dozens of locally owned ships were laid up. It was an era of depression from which Cardiff never really recovered, and despite intense activity at the port during the Second World War, coal exports continued to decline, finally ceasing in 1964. Redevelopment Coal exports were key to the local economy, which began to decline in the 1960s, when exports from the docks stopped. Housing clearances in the 1960s relocated many of the residents of Butetown, previously the residential core of the docklands, into unpopular tower blocks. The economic decline in the 1960s and 1970s led to a 25% vacancy rate of buildings and 60% unemployment in Butetown. The infrastructure and buildings in the area declined: by the 1970s and 1980s the area required development and investment. The price of land in the area decreased as there was a decline in traditional industry. This led to a rise in commercial developments, which were largely celebrated as a regeneration, although they displaced the local multicultural community as homes were