pre_text: Net cash from operating activities. Net cash from operating activities is the sum of (i) net income (loss) adjusted for non-cash items and (ii) changes in net working capital. The net cash from operating activities in 2019 was $1,869 million, increasing compared to $1,845 million in the prior year, mainly due to more favorable changes in net working capital, compensating lower net income. Net cash used in investing activities. Investing activities used $1,172 million of cash in 2019, decreasing from $1,212 million in the prior year. Payments for purchase of tangible assets, net of proceeds, totaled $1,174 million, compared to $1,262 million registered in the prior-year period. The 2019 numbers also included the proceeds from matured marketable securities of $200 million and the net cash outflow of $127 million for the acquisition of Norstel. Net cash used in financing activities. Net cash used in financing activities was $343 million for 2019, compared to the $122 million used in 2018. The 2019 amount included $281 million proceeds from long-term debt, $144 million of long-term debt repayment, $250 million of repurchase of common stock and $214 million of dividends paid to stockholders.
table: Year Ended December 31,
table: 2019 2018 2017
table: (In millions)
table: Net cash from operating activities $1,869 $1,845 $1,677
table: Net cash used in investing activities (1,172) (1,212) (1,468)
table: Net cash used in financing activities (343) (122) (106)
table: Effect of changes in exchange rates (13) (4) 27
table: Net cash increase $341 $507 $130
question: Analyse this data from a financial earnings document. What is the increase/ (decrease) in Net cash from operating activities from the period 2017 to 2019?