Calculate the ITR for each of the given years

Year COGS Inventory ITR

$20164,225,000875,000$

$20175,890,0001,200,000$

$20186,100,5001,210,000$

$20196,234,0001,190,000$

Comparing ITR of $2016$ with the ITR of $2019,$ has inventory productivity become better or worse?