Philip Rivers had an average of 7.9 passing yards per attempt between the 2006 and 2009 seasons.

philip river averages from 2006 to 2009
Interpreted as:
philip river passing averages from 2006 to 2009
NAMEGPAVGCMPATTPCTYDSYDS/GTDTD%INTINT%SCKSCKYRATE
Philip RiversPhilip Rivers647.91,1901,88463.214,803231.31055.6442.39962596.3
StatMuse has season-level data for yards per attempt going back to the 1932 season.

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