Table 2 The similarity index (J) of all communities during 1995–2021.

Code	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008
A	–	0.96	0.96	0.96	0.21	0.10	0.84	1.00	0.89	1.00	0.95	0.89	1.00	0.80
B	–	0.97	0.97	1.00	1.00	0.90	0.40	1.00	0.71	1.00	0.89	0.89	1.00	0.41
C	–	0.92	0.85	0.93	0.35	0.12	0.15	0.86	0.94	0.98	0.89	0.87	0.61	0.69
D	–	0.97	0.88	1.00	0.98	0.70	0.55	0.89	0.97	0.88	0.93	0.98	0.50	0.77
E	–	0.75	0.67	0.60	0.71	0.80	1.00	1.00	1.00	–	–	–	–	–
F	–	0.84	0.93	0.98	0.80	0.50	0.53	0.94	0.88	0.98	0.93	0.98	0.96	0.90
G	–	1.00	0.88	0.88	1.00	1.00	1.00	–	–	–	–	–	–	–
H	–	0.96	0.96	0.76	0.85	0.91	1.00	0.90	0.96	0.98	0.94	0.96	0.98	1.00
I	–	–	–	–	–	–	–	–	–	–	–	–	–	–
\(\bar{{{\boldsymbol{J}}}_{{\boldsymbol{t}}}}\)	0.92	0.89	0.89	0.74	0.60	0.68	0.94	0.91	0.97	0.92	0.93	0.84	0.76

Code	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	Std.err
A	0.79	0.61	0.95	0.80	0.67	0.52	0.95	0.36	0.59	0.83	0.91	0.69	0.40	0.27
B	0.97	0.95	0.47	1.00	0.94	0.89	0.89	0.94	1.00	0.94	0.59	0.59	0.49	0.21
C	0.29	0.87	0.40	0.47	0.66	0.78	0.94	0.87	0.81	0.88	0.92	0.77	–	0.27
D	0.37	0.91	0.91	0.44	0.49	0.98	0.90	0.98	0.91	0.98	0.98	0.93	0.27	0.20
E	–	–	–	–	–	–	–	–	–	–	–	–	–	0.16
F	0.86	0.94	0.94	0.92	0.89	0.74	0.86	0.57	0.91	0.94	0.87	0.60	0.59	0.15
G	–	–	–	–	–	–	–	–	–	–	–	–	–	0.06
H	0.96	0.98	0.98	0.98	0.96	0.96	0.87	0.96	0.93	0.96	0.98	0.88	0.61	0.08
I	–	–	–	–	–	–	–	–	–	–	–	–	0.37	–
\(\bar{{{\boldsymbol{J}}}_{{\boldsymbol{t}}}}\)	0.71	0.88	0.78	0.77	0.77	0.81	0.90	0.78	0.86	0.92	0.87	0.74	0.45	0.11

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