According to the financial statement, determine the enterprise's policy review. Is the management conservative in managing its business? Please give an example of how they recognize income or how they depreciate assets.
 

Operating Activities ITEM Net Income before Extraordinaries Net Income Growth Depreciation, Depletion & Amortization Depreciation and Depletion Amortization of Intangible Assets Deferred Taxes & Investment Tax Credit Deferred Taxes Investment Tax Credit Other Funds Funds from Operations Extraordinaries Changes in Working Capital Receivables Accounts Payable 2015 3.69B 1.95B 1.22B 730M (795M) (795M) 2.98B 7.82B 784M (973M) 35M 2016 10.22B 177.03% 2.34B 1.59B 751M (457M) (457M) 3.25B 15.35B 758M (1.49B) 81M 2017 15.93B 55.96% 3.03B 2.33B 692M (377M) (377M) 3.75B 22.33B 1.89B (1.61B) 138M Fiscal year is January-December. All values USD. 2018 22.11B 38.77% 4.32B 3.68B 640M 286M 286M 4.09B 30.8B (1.53B) (1.89B) 378M 2019 18.49B -16.40% 5.74B 5.18B 562M (37M) (37M) 4.88B 29.06B 7.25B (1.96B) 461M 5-YEAR TREND I.