How many copies of The Mortal Instruments have been sold?

As of my last knowledge update in October 2023, "The Mortal Instruments" series by Cassandra Clare has sold over 35 million copies worldwide. The series, which consists of six main books, has been translated into multiple languages and has garnered a significant fanbase, contributing to its extensive sales figures. The popularity of the series has also led to adaptations, including a film and a television series.