Month	Demand	Yearly average	Seasonal Index	Average SI	Deseasonalized	Time period
1/1/2020	2324					1
2/1/2020	2789					2
3/1/2020	2442					3
4/1/2020	3020					4
5/1/2020	2379					5
6/1/2020	3482					6
7/1/2020	3362					7
8/1/2020	2635					8
9/1/2020	2274					9
10/1/2020	3271					10
11/1/2020	3575					11
12/1/2020	4355	2992.33				12
1/1/2021	2243					13
2/1/2021	2705					14
3/1/2021	2966					15
4/1/2021	3256					16
5/1/2021	3684					17
6/1/2021	3819					18
7/1/2021	4604					19
8/1/2021	3104					20
9/1/2021	3133					21
10/1/2021	3712					22
11/1/2021	4215					23
12/1/2021	5152	3549.416667				24
1/1/2022	2691					25
2/1/2022	3139					26
3/1/2022	2870					27
4/1/2022	3424					28
5/1/2022	3786					29
6/1/2022	3722					30
7/1/2022	3165					31
8/1/2022	3287					32
9/1/2022	3578					33
10/1/2022	4477					34
11/1/2022	5248					35
12/1/2022	5503	3740.83				36

Find the seasonal index, average si, and deseasonalized.