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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities |  |
Net income attributable to Consolidated Water Co. Ltd. stockholders | $ 875,579 | $ 3,711,528
Income from continuing operations attributable to non-controlling interests | (632,915) | (730,005)
Net Income | 1,508,494 | 4,441,533
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Impairment loss for Mexico assets - discontinued operations | 963,540 | 3,351,842
Depreciation and amortization of discontinued operations | 4,545 | 4,545
Foreign currency transaction adjustment - discontinued operations | 53,039 | 3,528
Loss from discontinued operations | 1,552,955 | 1,542,328
Depreciation and amortization | 6,921,233 | 7,406,509
Deferred income tax benefit | (204,086) | (221,829)
Provision for doubtful accounts | 0 | 129,107
Unrealized (gain) loss on net put/call option | (818,000) | 26,000
Compensation expense relating to stock and stock option grants | 977,232 | 1,163,261
Loss (gain) on asset dispositions and impairments, net | 245,836 | (13,997)
Profit-sharing and equity in earnings of OC-BVI | (78,259) | (506,694)
Distribution of earnings from OC-BVI | 454,500 | 318,150
Impairment of goodwill | 2,900,000 |
Change in: |  |
Accounts receivable and contract assets | (5,878,771) | 2,541,096
Inventory | 293,254 | (102,551)
Prepaid expenses and other assets | (711,615) | (629,734)
Accounts payable(including related parties), accrued expenses and other current liabilities, and contract liabilities | (112,598) | (480,456)
Operating lease liabilities | 48,593 |
Deferred revenue | 467,710 | (1,700)
Net cash provided by operating activities - continuing operations | 8,587,602 | 18,970,938
Net cash used in operating activities - discontinued operations | (1,621,292) | (1,635,646)
Net cash provided by operating activities | 6,966,310 | 17,335,292
Cash flows from investing activities |  |
Purchase of certificate of deposit | (2,500,000) |
Additions to property, plant and equipment and construction in progress | (1,490,012) | (1,728,393)
Proceeds from asset dispositions | 45,560 | 8,638
Net cash used in investing activities | (3,944,452) | (11,119,755)
Cash flows from financing activities |  |
Dividends paid to common shareholders | (5,151,667) | (5,133,727)
Dividends paid to preferred shareholders | (11,015) | (11,990)
Dividends paid to non-controlling interests | (649,880) |
Repurchase of redeemable preferred stock | (16,799) | (1,728)
Proceeds received from exercise of stock options | 17,059 | 10,161
Principal repayments on long-term debt | (49,729) | (32,642)
Net cash used in financing activities | (5,862,031) | (5,169,926)
Net (decrease) increase in cash and cash equivalents | (2,840,173) | 1,045,611
Cash and cash equivalents at beginning of period | 43,794,150 | 42,071,083
Cash and cash equivalents at beginning of period - discontinued operations | 154,130 | 831,586
Less: cash and cash equivalents at end of period - discontinued operations | (750,048) | (154,130)
Cash and cash equivalents at end of period | 40,358,059 | 43,794,150
Non-cash transactions: |  |
Right-of-use assets obtained in exchange for new operating lease liabilities | 1,852,608 | 299,992
Purchase of equipment through issuance of long-term debt | 95,707 | 122,292
Aerex |  |
Cash flows from investing activities |  |
Purchase of non-controlling interest in PERC | 0 | (8,500,000)
PERC Water Corporation |  |
Cash flows from investing activities |  |
Purchase of non-controlling interest in PERC | $ 0 | $ (900,000)

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