No predictions loaded for 2000. This site serves NOAA predictions from its own store, and this period has not been fetched for Adak Bight 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/ak/adak-bight-9461406/2000
Adak Bight, AK tide table 2000 (printable) · Tide Almanac