Na-adabere na ezi obi na ọrụ magburu onwe ya, Ụlọ ọrụ anyị na-enweta aha ọma na ahịa mba ụwa.Ugbu a, anyị na ndị ahịa si ihe karịrị 100 mba na mpaghara guzobe mmekọrịta azụmahịa.Isi ahịa anyị dị na America, Europe, Middle East Asia na Africa na South East Asia.Maka ngbanwe ego nke 2011, America na-ekere òkè nke 36%, Europe 15%, Middle East Asia na Africa 35%, na ndị ọzọ 14%.