How to retrieve historical search volume data in google ad word api? -

i retrieving search volume below code want historic data last 5 years

 $selector = new targetingideaselector();   $selector->requesttype = 'stats';   $selector->ideatype = 'keyword';   $selector->requestedattributetypes = array('keyword_text', 'search_volume'); 

i know if add targeted_monthly_searches in requestedattributetypes able retrieve last 12 month data, want retrieve last 5 years data.

any appreciated.

thanks