The data given in the table shows the number of boys and girls enrolled in three different streams in a school over 5 years. (2012 to 2020)

Years	Arts		Science		Commerce
	Boys	Girls	Boys	Girls	Boys	Girls
2012	48	36	40	35	35	45
2014	42	43	42	32	32	42
2016	45	42	38	30	36	38
2018	39	46	41	23	28	34
2020	36	43	39	30	39	41

What is the difference between the average of the number of boys in the commerce stream for the 5 years and the average of the number of the girls in the Arts stream for the 5 years?