  
<prompt> Kammalallun alƙaluman haihiwa ga dukkan mata 'yan shekaru 40-49 ga shekarun bincike na 1990, 1997, 2002, 2007, 2009, and 2012, tare da kashi 95% na tabbacin tazara
  
 [[1990, 8.1], [1997, 6.8], [2002, 5.9], [2007, 5.3], [2009, 4.9], [2012, 4.6]] 
 <response> Hoto na 9 ya nuna raguwa ta sosai a shekaru da dama daga haihuwa 8.1 ga duk mace ɗaya a 1990 zuwa haihuwa 4.6 ga duk mace ɗaya a 2012.  