Year Sterling (millions) 1975-12-31 33 1976-12-31 41 1977-12-31 69 1978-12-31 91 1979-12-31 125 1980-12-31 120 1981-12-31 169 1982-12-31 231 1983-12-31 307 1984-12-31 614 1985-12-31 438 1986-12-31 442