The Tanzanian economy is heavily based on agriculture, which in 2013 accounted for 24.5 per cent of gross domestic product, provides 85% of exports, and accounted for half of the employed workforce; The agricultural sector grew 4.3 per cent in 2012, less than half of the Millennium Development Goal target of 10.8%. 16.4 per cent of the land is arable, with 2.4 per cent of the land planted with permanent crops. Tanzania's economy relies on farming, but climate change has impacted their farming.