The agricultural sector continues to dominate Kenya's economy, although only 15% of Kenya's total land area has sufficient fertility and rainfall to be farmed, and only 7 or 8% can be classified as first-class land. In 2006, almost 75% of working Kenyans made their living on the land, compared with 80% in 1980.[1] About one-half of total agricultural output is non-marketed subsistence production. Agriculture is the second largest contributor to Kenya's gross domestic product (GDP), after the service sector.