The Reserve Bank of Australia published its preliminary May Index of Commodity Prices, showing the index increased by 1.3 per cent on a monthly average basis in SDR terms after a 0.3 per cent decline in April. In AUD terms, the index decreased by 0.1 per cent in May. Rural, non-rural and base metals subindices all increased in the month. Over the past year, the index rose 16.8 per cent in SDR terms and 6.1 per cent in AUD terms, with higher lithium, coking coal and rural commodity prices more than offsetting declines in iron ore and gold. For recent months, the series continues to use preliminary export price estimates for iron ore, coking coal, thermal coal and LNG based on market information. Using spot prices for the bulk commodities index, the index increased by 1.0 per cent in May in SDR terms and remained 18.1 per cent higher over the past year.