While levels of use vary dramatically from country to country, for example some Northern European countries use very low quantities to treat animals compared with humans,[7] worldwide an estimated 73% of antimicrobials (mainly antibiotics) are consumed by farm animals.[8] Furthermore, a 2015 study also estimates that global agricultural antibiotic usage will increase by 67% from 2010 to 2030, mainly from increases in use in developing BRIC countries.[9]