Table 2.

Dynamic indicators from 2014 to 2020.

Index	2014	2015	2016	2017	2018	2019	2020
Net present value (ten thousand yuan)	6757	5938	7982	8326	8746	8927	9255
Net present value rate	16.7%	14.4%	21.4%	26.3%	29.1%	32.4%	35.8%
Profitability index	0.87	0.63	1.72	1.76	1.63	1.98	1.98
Internal rate of return	58.2%	54.8%	61.7%	62.8%	74.3%	77.8%	79.2%