Table 1 shows the monthly sales of tires over the last 5 years. Graphically analyze the time series and explain how you could use the simple model to forecast monthly sales.

Table 1: Monthly tires sales over 5 years

Month	Years
	1	2	3	4	5
January	19	27	29	33	36
February	20	26	28	32	34
March	20	30	37	41	43
April	22	30	39	44	47
May	27	35	40	50	49
June	27	32	35	52	51
July	24	26	23	44	40
August	30	30	35	45	43
September	32	35	40	53	49
October	36	39	49	63	57
November	37	38	46	54	55
December	42	47	56	71	66