Thank you in advance

What is the internal rate of return for this project? \begin{tabular}{cc} Year & Cash \\ \cline { 3 } 0 & 1,000,000 \\ 1 & 200,000 \\ 2 & 400,000 \\ 3 & 300,000 \\ 4 & 700,000 \\ & \\ & 18.02% \\ & 21.80% \\ & 19.56% \\ & 16.23% \\ & 18.59% \end{tabular}