N_A · Avogadro constant

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Takeaway

The relative standard uncertainty fell by a factor of about 541 from the 1969 to the 2014 edition (6.6×10⁻⁶ → 1.2×10⁻⁸): the error bars narrowed that much.
Of 8 earlier editions with a measured value, 6 have the 2022 value outside ±1σ (the error bar) and 3 outside ±2σ (the bar doubled); the normal expectation is about 1 in 3 and 1 in 22. The 2022 value is exact.
The largest move between editions came in 1973→1986, at 2.9 times the combined standard uncertainty of the two editions (|z| = 2.9).
Exact from the 2018 edition (fixed by definition rather than measured), so its uncertainty is zero.

Unit: mol⁻¹
Note: Tied to h through the molar Planck constant before 2019. Exact from the 2018 edition.
M1: Half-life (years): 5.21 (4.40–6.39)

Value ±1σ by edition2022

Relative deviation from the 2022 value (symmetric-log axis). Open circles: the error bar does not reach the 2022 value. Squares: exact.

Editionyear of the recommended values (data cut-off)	As printedexactly as in the source table; digits in parentheses are the standard uncertainty in the last digits	Standard uncertaintyhalf-width of the error bar (±1σ)	Relative standard uncertaintystandard uncertainty ÷ \|value\|: bar width relative to the value	Exactfixed by definition, uncertainty zero	z vs previous editionmove from the previous edition ÷ combined standard uncertainty of the two	z vs 2022(2022 value − this value) ÷ this edition's standard uncertainty	Source locationpage and table of the paper, or file and line of NIST's table
1969	6.022169(40) e23	4.0×10¹⁸	6.6×10⁻⁶			−0.7060	477 table XXXII
1973	6.022045(31) e23	3.1×10¹⁸	5.1×10⁻⁶		−2.4503	3.0890	718 table 33.1
1986	6.0221367(36) e23	3.6×10¹⁷	6.0×10⁻⁷		2.9383	1.1278	codata86 p.11 table 2
1998	6.022 141 99(47) e23	4.7×10¹⁶	7.8×10⁻⁸		1.4571	−2.6170	1998 ASCII:51
2002	6.022 1415(10) e23	1.0×10¹⁷	1.7×10⁻⁷		−0.4435	−0.7400	2002 ASCII:51
2006	6.022 141 79(30) e23	3.0×10¹⁶	5.0×10⁻⁸		0.2778	−3.4333	2006 ASCII:51
2010	6.022 141 29 e23	2.7×10¹⁶	4.5×10⁻⁸		−1.2388	−1.9630	2010 ASCII:53
2014	6.022 140 857 e23	7.4×10¹⁵	1.2×10⁻⁸		−1.5467	−1.3108	2014 ASCII:53
2018	6.022 140 76 e23			yes			2018 ASCII:54
2022	6.022 140 76 e23			yes			2022 ASCII:55