late 1950s. A 1987 survey found that 80 per cent of the work forces surveyed were described by respondents as consisting of a majority of one denomination; 20 per cent were overwhelmingly uni-denominational, with 95–100 per cent Catholic or Protestant employees. However, large organisations were much less likely to be segregated, and the level of segregation has decreased over the years. The British government has introduced numerous laws and regulations since the mid-1990s to prohibit discrimination on religious grounds, with the Fair Employment Commission (originally the Fair Employment Agency) exercising statutory powers to investigate allegations of discriminatory practices in Northern Ireland business and organisations. This has had a significant impact on the level of segregation in the workplace; John Whyte concludes that the result is that "segregation at work is one of the least acute forms of segregation in Northern Ireland." Housing Public housing is overwhelmingly segregated between the two communities. Inter-communal tensions have forced substantial numbers of people to move from mixed areas into areas inhabited exclusively by one denomination, thus increasing the degree of polarisation and segregation. The extent of self-segregation grew very rapidly with the outbreak of the Troubles. In 1969, 69 per cent of Protestants and 56 per cent of Catholics lived in streets where they were in their own majority; as the result of large-scale flight from mixed areas between 1969 and 1971 following outbreaks of violence, the respective proportions had by 1972 increased to 99 per cent of Protestants and 75 per cent of Catholics. In Belfast, the 1970s were a time of rising residential segregation. It was estimated in 2004 that 92.5% of public housing in Northern Ireland was divided along religious lines, with the figure rising to 98% in Belfast. Self-segregation is a continuing process, despite the Northern Ireland peace process. It was estimated in 2005 that more than 1,400 people a year were being forced to move as a consequence of intimidation. In response to inter-communal violence, the British Army constructed a number of high walls called "peace lines" to separate rival neighbourhoods. These have multiplied over the years and now number forty separate barriers, mostly located in Belfast. Despite the moves towards peace between Northern Ireland's political parties and most of its paramilitary groups, the construction of "peace lines" has actually increased during the ongoing peace process; the number of "peace lines" doubled in the ten years between 1995 and