What is the calculated value of the yearly average seasonalized forecasted demand for 2023 : SI and regression? This is the monthly average for the seasonalized forecast.

 

Demand	Yearly average	Seasonal Index	Average SI	Deseasonalized	Time period
2323	2981.7500	0.7791	0.7423	3129.59	1
2804	2981.7500	0.9404	0.8482	3305.89	2
2469	2981.7500	0.8280	0.8074	3058.01	3
3278	2981.7500	1.0994	1.0270	3191.76	4
3617	2981.7500	1.2130	1.1002	3287.51	5
2669	2981.7500	0.8951	1.0228	2609.59	6
2010	2981.7500	0.6741	0.7678	2617.99	7
2715	2981.7500	0.9105	0.9245	2936.63	8
2890	2981.7500	0.9692	0.9582	3015.97	9
2973	2981.7500	0.9971	1.0828	2745.67	10
3485	2981.7500	1.1688	1.2083	2884.18	11
4548	2981.7500	1.5253	1.5105	3010.91	12
2429	3320.6667	0.7315	0.7423	3272.39	13
2495	3320.6667	0.7514	0.8482	2941.59	14
2595	3320.6667	0.7815	0.8074	3214.06	15
3383	3320.6667	1.0188	1.0270	3293.99	16
3426	3320.6667	1.0317	1.1002	3113.91	17
3654	3320.6667	1.1004	1.0228	3572.66	18
2629	3320.6667	0.7917	0.7678	3424.22	19
2996	3320.6667	0.9022	0.9245	3240.56	20
3150	3320.6667	0.9486	0.9582	3287.30	21
3924	3320.6667	1.1817	1.0828	3623.95	22
4185	3320.6667	1.2603	1.2083	3463.50	23
4982	3320.6667	1.5003	1.5105	3298.23	24
2712	3786.3333	0.7163	0.7423	3653.65	25
3229	3786.3333	0.8528	0.8482	3806.97	26
3077	3786.3333	0.8127	0.8074	3811.05	27
3646	3786.3333	0.9629	1.0270	3550.07	28
3998	3786.3333	1.0559	1.1002	3633.81	29
4062	3786.3333	1.0728	1.0228	3971.58	30
3171	3786.3333	0.8375	0.7678	4130.17	31
3638	3786.3333	0.9608	0.9245	3934.97	32
3623	3786.3333	0.9569	0.9582	3780.92	33
4050	3786.3333	1.0696	1.0828	3740.31	34
4528	3786.3333	1.1959	1.2083	3747.37	35
5702	3786.3333	1.5059	1.5105	3774.89	36