This might help you.
You should also have a report which says how many cust have left or closed the CC account.
You should have the CustomerID and then there are other variables like Gender ,Age,Geography, then go more deep and find out Monthly income or monthly spending,how much interest they paid and accumulate all the available details . Proc REG and CORR will help you more if you want analyze which variable impacted more.
The question here is the sales is down , could be great completions ,aggressive sales by other company.If you have data you can prove lots of things .
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