Mepụta ihe dị mgbagwoju anya nke ahịrịokwu a Ka ọ na-erule October 2012 Global Infrastructure Partners nwere ngụkọta akụ n'okpuru njikwa nke ihe dị ka US $ 15 ijeri.
N'ezie, nsụgharị dị mgbagwoju anya nke ahịrịokwu ahụ bụ "Dị ka nke October 2016 Global Infrastructure Partners nwere ngụkọta ihe onwunwe n'okpuru njikwa nke ihe dị ka US $ 35 ijeri na ego ya na-elekwasị anya na mba OECD. "