Table 1.

Statistics of chemical production of new compounds for different periods and historical regimes as modeled by Eq. 1, where $\mu$ and $\sigma$ are the mean and the SD of the logarithm growth rate, respectively; $P^{ShW}$ and $P^{KS}$ stand for $P$ values of the Shapiro–Wilk and Kolmogorov–Smirnov normality tests; and Orgmet is an abbreviation for organometallic

Regimes and periods	Period	$\mu$, %	$\sigma$	$P^{ShW}$	$P^{KS}$
Proto-organic	Before 1861	4.04	0.4984	0.05267	0.5133
Organic	1861–1980	4.57	0.1251	0.07010	0.3391
Orgmet	1981–2015	2.96	0.0450	0.08297	0.6242
Orgmet-a	1981–1994	0.079	0.05356	0.4180	0.9040
Orgmet-b	1995–2015	4.40	0.03209	0.9770	0.9885
Pre-WW1	1861–1913	4.45	0.1229	0.5456	0.5069
WW1	1914–1918	−17.95	0.0682	0.7074	0.8721
Post-WW1a	1919–1924	18.98	0.1321	0.05726	0.3857
Post-WW1b	1925–1939	4.38	0.0487	0.05098	0.6151
WW2	1940–1945	−6.00	0.0745	0.9534	0.9666
Post-WW2a	1946–1959	12.11	0.0826	0.171	0.5765
Post-WW2b	1960–1979	4.25	0.1217	0.4731	0.7991