Table 4 The coupling coordination characteristics of two systems in the eight urban agglomerations of China.

Period	Year	D	U₁	U₂	U₁/U₂
12th Five Year Plan period	2011	0.487	0.196	0.712	0.336
	2012	0.489	0.161	0.799	0.217
	2013	0.594	0.368	0.681	0.628
	2014	0.682	0.466	0.778	0.618
	2015	0.679	0.467	0.775	0.660
13th Five Year Plan period	2016	0.694	0.501	0.778	0.690
	2017	0.777	0.685	0.775	0.920
	2018	0.803	0.638	0.958	0.753
	2019	0.834	0.767	0.863	0.942
	2020	0.770	0.633	0.861	0.782
14th Five Year Plan period	2021	0.756	0.628	0.829	0.809
14th Five Year Plan period	2022	0.778	0.627	0.891	0.745

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