Impact of COVID-19 on Port Production and Operation Based on System Dynamics: A Case Study of Shanghai Port in China

Table 4

Comparison of simulation results and actual results of GDP.

Year	Nominal GDP	Simulation GDP	Relative error (%)
2011	19539	18941	3.1
2012	20558	20001	2.7
2013	22264	21801	2.1
2014	24068	23661	1.7
2015	25659	25139	2.0
2016	27466	26879	2.1
2017	30134	29595	1.8
2018	32680	32196	1.5
2019	38155	37893	0.7
2020	38701	38479	0.6