The Spanish recorded that when the Great Temple was dedicated in 1487 CE 80,000 people were sacrificed. 20,000 people were regularly sacrificed every year. With the skull of the victim, they would pin them on racks outside of the temple. Since sacrificing became a daily thing and the idea consumed them even if it was their religion, they could not stop the great amounts of people getting sacrificed.
Document 6
Aztec Sacrifice
http://www.aztec-history.com/aztec-sacrifice.html
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Document 6
Aztec Sacrifice
http://www.aztec-history.com/aztec-sacrifice.html
No author or date