Research on Food Security Risk Assessment and Early Warning in China Based on BP Neural Network Model

Table 5

Comprehensive evaluation results of food security in China.

Year	Comprehensive evaluation of food security	Alertness
2000	−0.10012	Heavy warning
2001	−0.02354	Heavy warning
2002	−0.0403	Heavy warning
2003	−0.0876	Heavy warning
2004	0.162666	Moderate warning
2005	0.133916	Moderate warning
2006	0.160253	Moderate warning
2007	0.186373	Moderate warning
2008	0.302155	Moderate warning
2009	0.364197	Light warning
2010	0.424979	Light warning
2011	0.497854	Light warning
2012	0.500631	Light warning
2013	0.53005	Light warning
2014	0.559451	Light warning
2015	0.612983	No warning
2016	0.59172	No warning
2017	0.619918	No warning
2018	0.574006	Light warning
2019	0.552851	Light warning