The following table shows the expenditure (in 000s) made by a company in different departments over the years. What is the ratio of the total expenditure made by the IT department and the operations department over the years?

Years	IT	Operations	Marketing	Human   resource
2015	220	250	200	120
2016	320	350	300	250
2017	410	500	400	320
2018	450	500	450	410