Study the given table and answer the question.
The table displays the number of cars produced (in lakhs) by six different brands between 2018 and 2023.

Type	2018	2019	2000	2021	2022	2023
A	36	40	42	45	47	42
B	23	37	28	32	34	26
C	45	47	51	54	56	48
D	35	37	42	32	36	28
E	57	56	52	38	48	42
F	43	45	56	41	52	40

Find the difference in the average production of B and D during 2018-2023.