all i need is monthly seasonal index

Average Pizza Price: $25.00 Seasonality forecast monthly seasonal index 2018 2019 2020 0.11 0.16 $ 9.60 0.47 0.51 $ 31.20 0.60 0.58 $ 36.00 1.52 1.54 $ 94.80 MONTH January February March April May June July August Sept Oct Nov 2018 SALES DOLLARS (000) 5 22 28 71 90 81 25 30 71 31 22 83 1.93 1.79 $ 110.40 2019 SALES DOLLARS (000) 8 26 30 79 92 86 28 34 84 34 28 87 616 1.74 1.68 $ 103.20 0.54 0.55 $ 33.60 0.64 0.66 $ 40.80 1.52 1.64 $ 100.80 0.67 0.66 $ 40.80 0.47 0.55 Dec TOTAL YR $ 33.60 1.78 1.69 559 $ 104.40 S 739.20 Averages 46.58 51.33 Average for 2020: 61.6