PSO-Based ANN for Studying on Carrying Capacity of Iron Ore Resources-Economy-Environment in Southern Shaanxi, China

Table 2

Comparison of historical and simulated values of regional GDP.

Year	Real GDP (100 million yuans)	Simulated GDP value (100 million yuans)	Error (%)
2010	1122.66	1122.66	0.00
2011	1417.60	1350.50	−4.97
2012	1674.79	1624.25	−3.11
2013	1997.16	1953.20	−2.25
2014	2267.26	2270.52	0.14
2015	2433.18	2548.68	4.53
2016	2691.48	2825.30	4.74

Data source: Shaanxi statistical yearbook.