President Jimmy Carter and Rosalynn Carter are the co-founders of The Carter Center, a not-for-profit, non-governmental organization (NGO) dedicated to championing human rights and alleviating human suffering. The NGO has led the fight against Guinea worm disease, reducing the number of cases worldwide from 3.5 million in 1986 to 521 as of October 2012. The center has also sent observers to 92 elections in 37 countries in a bid to strengthen democracy, and has taught farming methods that have helped more than eight million small-scale farmers in 15 African nations to double or triple grain production. The Carters are active advocates for Habitat for Humanity and have established the Jimmy & Rosalynn Work Project, a campaign that since 1984 has built and restored homes around the world. Together, they have written over 30 books on topics ranging from the state of American politics and democracy, to peace and human rights at home and abroad. They have won countless international awards and commendations including, for President Carter, the Nobel Prize for Peace in 2002.