how do i Calculate the return for each month: (Pt Pt-1)/Pt-1 [Pt is the period ending adjusted price. Pt-1 is the period beginning adjusted price.]. P

\begin{tabular}{|r|r|r|r|r|r|r|} \hline Date & Open & High & Low & \multicolumn{2}{l|}{ Close } & Adj Close Volume \\ \hline 10/1/2018 & 46.75 & 46.88 & 43.09 & 44.2 & 32.59253 & 0 \\ \hline 11/1/2018 & 44.61 & 45.91 & 43.82 & 45.62 & 33.63961 & 0 \\ \hline 12/1/2018 & 45.99 & 45.99 & 38.52 & 40.87 & 30.13703 & 0 \\ \hline 1/1/2019 & 40.87 & 43.3 & 40 & 43.3 & 32.93291 & 0 \\ \hline 2/1/2019 & 43.45 & 44.92 & 43.45 & 44.72 & 34.01292 & 0 \\ \hline 3/1/2019 & 44.93 & 45.08 & 43.92 & 44.9 & 34.14983 & 0 \\ \hline 4/1/2019 & 45.4 & 46.44 & 45.34 & 46.44 & 35.49586 & 0 \\ \hline 5/1/2019 & 46.03 & 46.26 & 43.99 & 43.99 & 33.62323 & 0 \\ \hline 6/1/2019 & 44.1 & 45.94 & 44.1 & 45.6 & 34.85382 & 0 \\ \hline 7/1/2019 & 45.88 & 46.72 & 45.88 & 46.01 & 36.04276 & 0 \\ \hline 8/1/2019 & 45.65 & 45.65 & 44.17 & 45.59 & 35.71375 & 0 \\ \hline 9/1/2019 & 45.24 & 46.74 & 45.24 & 46.14 & 36.1446 & 0 \\ \hline 10/1/2019 & 45.56 & 47.03 & 44.77 & 46.83 & 36.86179 & 0 \\ \hline 11/1/2019 & 47.2 & 48.59 & 47.2 & 48.4 & 38.09759 & 0 \end{tabular}