Cadbury started an in-depth study to forecast customer demand based on data it previously recorded. Management at the global brand started recording sales data in two forms: yearly, & quarterly. The following tables show the recorded data for the past five years: Year 2017 2018 2019 2020 2021 Actual Demand 128 148 161 149 137 2018 2019 2020 2021 Quarter 1 2 39 42 36 2017 30 42 31 25 47 34 41 33 33 45 31 28 41 42 3 4 35 31 37 The seasonal indices for Quarters 1, 2, 3, & 4 are respectively 1.982, 0.975, 1.038, 1.003 0.995, 1.156, 0.984, 0.863 9.82, 0.975, 1.038, 1.003