percentage of residents born overseas (39.4%) is greater than both the national (27%) and metropolitan (31.3%) average. 11.3% of residents were born in England; 3% in New Zealand, and significant smaller percentages from Malaysia, India and Scotland. 14% of residents speak a language other than English at home. Unemployment (3.4%) is lower than the regional average (3.7%) and socio-economic disadvantage less than the City of Gosnells as whole. Weekly household incomes are characterised by a lower proportion of both low and higher income households compared with the Perth average. There are no major differences between the religious affiliation of Thornlie and the Perth region as a whole. The dominant religion is Catholicism (22.4%) followed by Anglicanism (19.5%), Islam (4.6%) and Buddhism (3.5%). Since 2001 there has been a mild decline in the number of Catholics and Anglicans and an increase in the number of Muslims, by 2002 Thornlie had the highest population of Muslims in Perth. Crestwood Estate Thornlie contains Crestwood Estate, a model housing development still noted for its successful implementation of the Radburn design principles. Original Radburn architect Clarence Stein reportedly described it as the "first perfect Radburn scheme in the world", and from 1973 to 1976 it received both national and international recognition. Whilst the Radburn principles flavoured many other post-war developments across Australia including the Perth suburbs of City Beach and Karawara, it remains one of the few suburbs that has not undergone a sustained process of "de-Radburnisation" since the 1990s. From a heritage perspective Crestwood is a highly significant link to a major twentieth century urban design movement and a prime example of 1970s progressive suburban design. Crestwood was based on the ideas of Paul Ritter, the City of Perth's first city planner. Ritter had spent many years advocating the idea that "it takes a village to raise a child". One of his lectures on creating innovative urban environments to meet the needs of family and community life captured the imagination of property developer Ron Sloan. Together Sloan, Ritter and planner Hugh Reynolds designed a residential estate according to a strict design brief. Crestwood was to be equally efficient and economical as a conventional subdivision, with the same density of homes (), but 8% additional open space. Every house was to face a park and roads were to be designed to limit the speed of vehicles. There was to be passive surveillance of recreational areas,