Table 1

EG Index results.

EG index Beijing–Tianjin–Hebei region
2000 0.001347
2001 0.001302
2002 0.001257
2003 0.001211
2004 0.001166
2005 0.001317
2006 0.001178
2007 0.001053
2008 0.000923
2009 0.000744
2010 0.000703
2011 0.000616
2012 0.000912
2013 0.000901
2014 0.000802
2015 0.000741
2016 0.000624
2017 0.000579
2018 0.000534
2019 0.000489
2020 0.000444

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