Did the number of deaths soar to 4 million or by 4 million? The result would be different depending on which one you used. If there were 1.5 million deaths in 2011 and the number soared to 4 million in 2016, there were 4 million in 2016. If there were 1.5 million deaths in 2011 and the number soared by 4 million in 2016, there were 5.5 million in 2016.