Union Health Minister Harsh Vardhan Wednesday announced the government's initiative a nationwide social movement to encourage people to donate blood on the occasion of the National Voluntary Blood Donation Day. The movement is aimed at bridging the gap between the demand and supply of blood. While addressing more than 2000 school children and other volunteers he said 'We have a shortfall of 2-3 million units per year in India. Through more voluntarism we can easily make up the deficit. Till date 84 percent of the requirement of safe blood has been fulfilled. We must take it to 100 percent soon.'