Some random documents lodged at Companies House including Celtic’s accounts from 1982 &83. In 1982 Celtic had income (including transfer fees) of £1.17m. This was £102.5 million in 2018/19, an increase of 8,665%.
Total wages for Celtic in 1981/82 were £734k, with just one person at the club earning more than £30,000 in the year. In 2018/19 the wage bill was £56.1 million, with the highest paid director earning £3.55 million, nearly five times that of the whole club in 1982.