Although employment in Birmingham's restricted manufacturing sector shrank by 10% between 1951 and 1966, this was more than made up during the early post-war period for by employment in the service sector, which grew from 35% of the city's workforce in 1951 to 45% in 1966. As the commercial centre of the country's most successful regional economy, Central Birmingham was the main focus outside London for the post-war office building boom. Service sector employment in the Birmingham conurbation grew faster than in any other region between 1953 and 1964, and the same period saw 3 million sq ft of office space constructed in the city centre and Edgbaston. The city's economic boom saw the rapid growth of a substantial merchant banking sector, as major London and international banks established themselves within the city, and professional and scientific services, finance and insurance also grew particularly strongly. However this service sector growth itself attracted government restrictions from 1965. Declaring the growth in population and employment within Birmingham to be a "threatening situation", the incoming Labour Government of 1964 sought "to control the growth of office accommodation in Birmingham and the rest of the Birmingham conurbation before it got out of hand, in the same way as they control the growth of industrial employment". Although the City Council had encouraged service sector expansion during the late 1950s and early 1960s, central government extended the Control of Office Employment Act 1965 to the Birmingham conurbation from 1965, effectively banning all further office development for almost two decades.