Muri uyo mwaka, izo ntererano zarenga imiliyaridi zibiri, aho Amerika ari yo yatanze menshi, yangana n'ibice 12%, mu gihe ishirahamwe rya wa mutunzi ruhebwa kw'isi, Bill and Melinda Gates Foundation, naryo ryatanze ibice 10% vy'intererano zitangwa ku gushaka.
