Y T Y+T S Y+S Centered four- quarter Deviation Adjusted moving from the seasonal average trend index Sale Year Quarter (in '000) to 3 d.p.) to 3 d.p.) (Correct (Correct (Correct to 3 d.p.) Deseasonalized sale (in '000) (Correct to 3 d.p.) 1 130 0.931 139.635 2 145 1.064 A7 2017 3 140 A1 0.981 0.948 147.679 4 150 147.125 A3 A6 141.777 1 142 152.750 0.930 0.931 152.524 2 168 160.250 1.048 1.064 157.895 2018 3 162 169.750 0.954 0.948 48 4 188 42 1.037 46 177.694 1 180 192.750 0.934 0.931 49 2 222 207.250 A4 1.064 208.647 2019 3 200 224.500 0.891 0.948 210.970 4 266 242.000 1.099 46 251.418 1 240 263.250 0.912 0.931 257.787 2 302 286.500 1.054 1.064 283.835 2020 3 290 0.948 305.907 4 362 46 A10 Seasonal index Adjusted seasonal index Quarter (Correct to 3 d.p.) (Correct to 3 d.p.) 1 A5 0.931 2 1.058 3 0.942 4 1.052 1.064 0.948 46 Average 0.994 Trend Value Year Quarter t (y) Adjusted seasonal index 2021 1 17 B1 0.924 Forecast sale (in '000) 291.617 2 18 328.623 1.057 B3 3 19 B2 0.967 330.369 4 20 354.663 1.051 372.751