Example: annual subscriptions

Data

• 1903 4/-
• 1921 5/-
• 1933 7/6d
• 1942 10/-
• 1948 15/-
• 1952 £1
• 1957 £1/10/-
• 1964 £1/15/-
• 1973 £2.25
• 1976 £4.00
• 1979 £5.00
• 1984 £6.00
• 1985 £7.00
• 1987 £9.00
• 1990 £10.00
• 1991 £12.00
• 1993 £14.00
• 1994 £15.00
• 1995 £16.00
• 2001 £18.00
• 2002 £20.00
• 2009 £25.00
• 2016 £28.00
• 2017 £30.00
• 2018 £40.00