The question 'when was a decimal currency introduced' would not be answerable, because this is lost in the mists of time.
However, the use of the words 'the decimal currency' indicates that the question refers to the conversion of the British pound (aka Pound Sterling) to decimal in 1971. The Brits are not known for being in a hurry to change things.
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1955
pta ni saleyo
All of these denominations beloing to the old redundant British predecimal currency system used by many of the British Empire/Commonwealth countries. 5 Guineas (105 Shillings) - converted to £5.25 in decimal currency. 2 Shillings (1 Forin) - converted to £0.10 in decimal currency. 2 Florins (4 Shillings) - converted to £0.20 in decimal currency. 12 Pence (1 Shilling) - converted to £0.05 in decimal currency.
Madagascar and Mauritania.
When they wanted to know what the half of 1 was...