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Table 6 Gross domestic product of four cities from 2016 to 2023 (Unit: 100 million yuan)

From: Prediction of population aging trend and analysis of influencing factors based on grey fractional-order and grey relational models: a case study of Jiangsu Province, China

Year

2016

2017

2018

2019

2020

2021

2022

2023

Nanjing

10,819.14

11,894.00

13,009.17

14,045.15

14,782.95

16,290.13

16,776.32

17,421.40

Suzhou

15,445.26

16,997.47

18,263.48

19,264.80

20,180.45

23,168.21

23,805.29

24,653.37

Nantong

7151.69

8034.07

8753.23

9369.39

10,018.31

10,946.95

11,309.02

11,813.27

Xuzhou

5809.81

6333.50

6710.36

7053.35

7284.77

8007.44

8412.38

8900.44