aluminium replaced aluminium-bronze in the 1, 5 and 10 millieme coins in 1972, followed by brass in the 5 and 10 millieme coins in 1973. aluminium-bronze 2 piastre and cupro-nickel 20 piastre coins were introduced in 1980, followed by aluminium-bronze 1 and 5 piastre coins in 1984. in 1992, brass 5 and 10 piastre coins were introduced, followed by holed, cupro-nickel 25 piastre coins in 1993. the size of 5 piastre coins was reduced in 2004, 10 and 25 piastre coins - in 2008.