Since 1977, both pro- and anti-European views have had majority support at different times, with some dramatic swings between the two camps. In the United Kingdom European Community membership referendum of 1975, two-thirds of British voters favoured continued EEC membership. The highest-ever rejection of membership was in 1980, the first full year of Prime Minister Margaret Thatcher's term of office, with 65% opposed to and 26% in favour of membership.