The group has also focused on achieving cost advantages, rationalising declining businesses, growing through moderate investments and accelerating growth in adjacent businesses. Capital was spent lowering the cost base at key mills and reducing debt. Data for the 2015 financial year reflected an effective execution of strategy, with net profit increasing by 24% to US$167 million. The weak rand/dollar exchange rate benefitted South African operations, boosted by strong sales demand and average net sales prices. The group has decided to buy into energy efficiency and its specialised cellulose business, which remains the biggest contributor to profit. The waste-paper packaging Enstra and Cape Kraft Mills were put up for sale by Sappi in line with a strategy to focus on the virgin fibre packaging business in South Africa.