  
<prompt> Oke ọnwụ ụmụaka maka ụmụaka ekpughepuru n'egwu nke ọnwụ | Oke ọnwụ ụmụaka maka ụmụaka ekpughepuru n'egwu nke ọnwụ | (Nwa ọhụrụ, 1990, 21.4) (Ka amụchara nwa ọhụrụ, 1990, 12.4) (Ụmụ ntakịrị, 1990, 33.8) (Nwata, 1990, 5.1) (Erughi afọ ise, 1990, 38.8) (Nwa ọhụrụ, 1997, 19) (Ka amụchara nwa ọhụrụ, 1997, 9.6) (Ụmụ ntakịrị, 1997, 28.5) (Nwata, 1997, 5.9) (Erughi afọ ise, 1997, 34.2) (Nwa ọhụrụ, 2002, 15.5) (Ka amụchara nwa ọhụrụ, 2002, 6.6) (Ụmụ ntakịrị, 2002, 22.1) (Nwata, 2002, 5) (Erughi afọ ise, 2002, 27) (Nwa ọhụrụ, 2007, 13.6) (Ka amụchara nwa ọhụrụ, 2007, 5.7) (Ụmụ ntakịrị, 2007, 19.3) (Nwata, 2007, 2) (Erughi afọ ise, 2007, 21.3) (Nwa ọhụrụ, 2009, 15.4) (Ka amụchara nwa ọhụrụ, 2009, 7.7) (Ụmụ ntakịrị, 2009, 23.1) (Nwata, 2009, 5.1) (Erughi afọ ise, 2009, 28.1) (Nwa ọhụrụ, 2012, 13.7) (Ka amụchara nwa ọhụrụ, 2012, 3.5) (Ụmụ ntakịrị, 2012, 17.2) (Nwata, 2012, 3.8) (Erughi afọ ise, 2012, 21) <response> Oke ọnwụ n'oge amụchara nwa ọhụrụ, ma ọ bụ ọnwụ n'afọ izizi nke ndụ, mana ka ọnwa izizi gachara, gosipụtara mgbanwe na adịghị ukwuu n'etiti afọ ndị sotere onwe ha site na 1990 ruo 2009 wee gbadaa nke ukwuu site na ọnwụ 7.7 kwa ọmụmụ nwa 1,000 dị ndụ na 2009 ruo ọnwụ 3.5 na 2012.  