X1

X2

X3

X4

X5

X6

Average value

Guangzhou

0.617

0.634

0.742

0.716

0.672

0.630

0.668

Shenzhen

0.678

0.790

0.673

0.752

0.649

0.611

0.692

Zhuhai

0.781

0.744

0.609

0.697

0.710

0.677

0.703

Dongguan

0.629

0.610

0.601

0.616

0.612

0.749

0.636

Huizhou

0.733

0.720

0.644

0.785

0.715

0.767

0.727

Shanghai

0.685

0.703

0.641

0.822

0.757

0.645

0.709

Average value

0.688

0.699

0.654

0.713

0.671

0.687

0.685