group by custom column percent increase

I am working with some health related data and I am trying to build a DAX query to give me precent increase by client id and date on the table lines.  Any suggestion on how to transform this data to show client id and +- %Change?

Thank you in advance for your help.

The data looks like the following

ClientId               Date                Score               %Increase??

1                     10/1/2015             40

1                     05/4/2016             100

3                     1/1/2016               30

3                     6/7/2016               40

5                     3/12/2016              60

5                     6/20/2016              80