Mezue ahịrịokwu na-esonụ: Tupu afọ 2011 enwere ụfọdụ mmechi ụzọ ụgbọ oloko zuru oke maka mwakpo njem (Jenụwarị 1<unk>13, 1966, Eprel 1<unk>11, 1980, Disemba 20<unk>22, 2005) na blackouts (Novemba 9<unk>10, 1965, Julaị 13<unk>14, 1977,
Ọgọstụ 14<unk>16, 2003).