 The action was due to inflation reducing its value, and the high cost of bronze.Around the same time other countries removed their bronze coins—New Zealand removed its one and two cent coins in 1990, while the United Kingdom and Ireland changed their bronze one and two pence coins into copper-plated steel.The one cent coin was produced as proof and uncirculated coins in 1986, 1991, 2006 and 2010 as part of mint sets.