My understanding is that it's almost 20% less than it was in the sixties.
On April 20th, 2010. See this statement in context.
On April 20th, 2010. See this statement in context.
April 20th, 2010 / 12:10 p.m.
Prof. John Martin
My understanding is that it's almost 20% less than it was in the sixties.
See context to find out what was said next.