Study the given table carefully and answer the following question.

Years

Company

Production of Air Purifiers (in thousand numbers)

2017

2018

A

26

23

B

22

22

C

18

20

D

21

28

What is the ratio of the production of air purifiers by company A in 2017 to the production of air purifies by company D in 2018?

Question

Years Company	Production of Air Purifiers (in thousand numbers)
Years Company	2017	2018
A	26	23
B	22	22
C	18	20
D	21	28