It is in fact 30-80%: see page 11 of the PDF: <a href="http:&#x2F;&#x2F;0b4af6cdc2f0c5998459-c0245c5c937c5dedcca3f1764ecc9b2f.r43.cf2.rackcdn.com&#x2F;23105-fast16-papers-schroeder.pdf" rel="nofollow">http:&#x2F;&#x2F;0b4af6cdc2f0c5998459-c0245c5c937c5dedcca3f1764ecc9b2f...</a>