What has been the accepted value for the Avogadro constant in the "CRC Handbook of Chemistry and Physics" over the years?
I dislike offsite image links since they disappear over time. So below is Table 1 from andselisk's comment on the question.
The paper itself is behind a firewall and I can't see it.

See Table 1 in Becker, P. History and Progress in the Accurate Determination of the Avogadro Constant. Rep. Prog. Phys. 2001, 64 (12), 1945–2008. DOI: 10.1088/0034-4885/64/12/206. It covers year up to the year 2001 and is going to save a lot of time. – andselisk