need help with measuring forcast accuracy page

\begin{tabular}{|c|c|c|c|c|c|c|} \hline Period & Year & \begin{tabular}{c} Enrollment \\ (Actual) \end{tabular} & \begin{tabular}{l} Forecast \\ (Plan) \end{tabular} & \begin{tabular}{l} Forecast Error \\ (Actual-Plan) \end{tabular} & \begin{tabular}{c} Absolute \\ Error \end{tabular} & \begin{tabular}{c} Error \% = \\ Absolute \\ Error/Actual \\ Enrollment \end{tabular} \\ \hline 1 & 2011 & 11,467 & 11,850 & -383 & 383 & 3.34% \\ \hline 2 & 2012 & 11,669 & 11,891 & -222 & 222 & 1.90% \\ \hline 3 & 2013 & 11,728 & 11,472 & 256 & 256 & 2.18% \\ \hline 4 & 2014 & 11,463 & 10,799 & 664 & 664 & 5.79% \\ \hline 5 & 2015 & 11,843 & 11,447 & 396 & 396 & 3.34% \\ \hline 6 & 2016 & 12,337 & 11,790 & 547 & 547 & 4.43% \\ \hline 7 & 2017 & 11,563 & 11,809 & -246 & 246 & 2.13% \\ \hline 8 & 2018 & 12,580 & 12,791 & -211 & 211 & 1.68% \\ \hline 9 & 2019 & 12,891 & 13,006 & -115 & 115 & 0.89% \\ \hline 10 & 2020 & 12,996 & 12,652 & 344 & 344 & 2.65% \\ \hline 11 & 2021 & 12,725 & 12,414 & 311 & 311 & 2.44% \\ \hline 12 & 2022 & 14,792 & 12,846 & 1,946 & 1,946 & 13.16% \\ \hline 13 & 2023 & 13,455 & 12,562 & 893 & 893 & 6.64% \\ \hline 14 & 2024 & 14,475 & 14,769 & -294 & 294 & 2.03% \\ \hline 15 & 2025 & 15,083 & 15,261 & -178 & 178 & 1.18% \\ \hline & & & & Totals: & 7,006 & 53.8% \\ \hline \end{tabular} *Measuring Forecast Accuracy*