I would like to ask what is the meaning of "working capital investment increases at a rate of 163 percent of the change in cash generated from operating activities until 2018" ?

Given that

xx company

Pro Forma Cash Flow Forecast

2015 2016 2017 2018

Cash flows from operating activities

Cash generated from operations 39 43 47 52

Income tax paid 4 3 6 6

Net cash generated from or (used in) 35 40 41 46

operating activities

Cash flow from investing activities

working capital investment 52

What is the amount of 2016, 2017, 2018 working capital investment?

Thank you so much!