Table :
"","Domestic","","International",""
"","September 30,","","September 30,",""
"","2019","2018","2019","2018"
"Discount rate","4.00%","3.75%","1.90%","2.80%"
"Expected return on plan assets","","","3.40%","3.70%"
"Rate of compensation increase","","","- - %","- - %"

Question : What is the year on year percentage change in domestic discount rate between 2018 and 2019?