Isles, with under annually, and 105 days reporting over 1 mm of rain. Demography During the Great Depression of the 1930s, many unemployed Welsh people who walked up the Great West Road looking for employment settled in Slough. According to the 2011 census, 45.7% of the population was white (34.5% white British, 1.1% white Irish, 0.2% gypsy or Irish Traveller, 9.9% other white), 3.4% of mixed race (1.2% white and black Caribbean, 0.4% white and black African, 1.0% white and Asian, 0.8% other mixed), 39.7% Asian (17.7% Indian, 15.6% Pakistani, 0.4% Bangladeshi, 0.6% Chinese, 5.4% other Asian), 8.6% black (5.4% African, 2.2% Caribbean, 1.0% other black), 0.7% Arab and 1.9% of other ethnic heritage. In the post-war years, immigrants from the Commonwealth, notably Anguilla, Antigua and Barbuda, India and Pakistan came to the town. There is also a significant Irish and London-Irish population from London overspill. In the early 1950s, there were a number of Polish refugee camps scattered around the Slough area. As returning to Poland (then in the Soviet Bloc) was not considered an option by many of the wartime refugees, many Polish families decided to settle in Slough. In time, a Polish-speaking Roman Catholic parish was established with its own church building. A new wave of Polish migration to Slough has followed since Poland became part of the European Union. Slough Council elected the country's first black female mayor, Lydia Simmons, in 1984. Figures from the 2011 census showed that 41.2% of Slough's population identified as Christian, 23.3% as Muslim, 10.6% as Sikh, 6.2% as Hindu, 0.5% as Buddhist, 0.1% as Jewish, 0.3% as having other religions, 12.1% as having no religion and 5.7% did not answer the question. Slough has the highest percentage of Sikh residents in the country according to the census figures. Slough also has the highest percentage of Muslim and Hindu residents in the South East region. {|class="wikitable sortable" |+ Immigrants in Slough (2011 census) ! Country of birth ! Number resident |- | |11,544 |- | |11,244 |- | |8,341 |- | |2,183 |- | |1,364 |- | |1,352 |- | |1,247 |- | |1,219 |- | |828 |- | |759 |- |} In July 2007 Slough was the subject of a documentary by the BBC's Panorama series, entitled "Immigration – how we lost count". The programme highlighted Slough and other affordable towns close to London had a much greater rise in