Table 4 σ-convergence test results across the country and four regions.

Year	Nationwide	Eastern China	Central China	Western China	Northeastern China
2011	0.392	0.385	0.357	0.287	0.377
2012	0.383	0.345	0.316	0.467	0.423
2013	0.313	0.264	0.298	0.361	0.342
2014	0.338	0.255	0.293	0.453	0.374
2015	0.329	0.232	0.289	0.474	0.347
2016	0.356	0.234	0.299	0.530	0.370
2017	0.330	0.259	0.330	0.405	0.341
2018	0.378	0.312	0.277	0.636	0.366
2019	0.351	0.316	0.295	0.513	0.348

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