in 1967, coins were introduced in denominations of 1-, 5-, 10-, 25 and 50 cents. the 1 and 5 cents were struck in nickel-brass, with the other denominations struck in cupro-nickel. in 1996, high inflation caused the introduction of 1, 5 and 10 dollars coins. the 1 and 5 dollars are struck in copper-plated steel, whilst the 10 dollars is struck in nickel-plated steel and has an equilateral-curved heptagonal shape.