327 million coins were minted annually in the Tang dynasty 's prosperous Tianbao period of 742 -- 755 .
Only 220 million coins minted annually from 118 BCE to 5 CE during the Han dynasty .
327 million coins were minted annually in the Tang dynasty 's prosperous Tianbao period of 742 -- 755 , and only 220 million coins minted annually from 118 BCE to 5 CE during the Han dynasty .