No predictions loaded for 2006. This site serves NOAA predictions from its own store, and this period has not been fetched for Oak Bluffs yet. Nothing is estimated or interpolated in its place. NOAA's own page for the station has the official table: tidesandcurrents.noaa.gov.
tidealmanac.site/us/ma/oak-bluffs-8448208/2006
Oak Bluffs, MA tide table 2006 (printable) · Tide Almanac