How many slaves were there on a slave ship in the middle passage?

A typical slave ship carried no less then 200 and no more than 500 slaves when it departed from West Africa. There may have been as many as 20 million slaves transported to the Americas over the years of the slave trade. On most voyages one third of the ship's cargo failed to complete the voyage due to poor hygiene, illness or being crushed by the number of people, That cargo loss (slaves) where merely part of the cost of doing business. A boat from the Middle Passage would have the lower decks crammed full of slaves. Normally the wasted space would only count up to around 1 or 2 metres. Life was tough for a slave. Your hands were cuffed and you would be in pitch black for a few months. Many were temporarily blinded through shock of seeing bright light after all those days.