Simplify the following text for a Grade 11 native English-speaking person.
Original: In 2007 , companies produced for export extract US$ 13 million worth of ephedrine from 30,000 tons of ephedra annually , 10 times the amount that is used in traditional Chinese medicine .
Simplified: Companies extract $ 13 million worth of ephedrine from 30,000 tons of ephedra per year , 10 times the amount that is used in traditional Chinese medicine .