An assumption supported by all supplied test data. The #1 objection I have with my post is it continues the bad practice of not using a proper CSV module. Overkill, if the example data is truly representative of all this program will ever have to deal with, but of course that's rarely the case. Assuming only the one column will contain periods is the least of my sins.
And, as 1nickt demonstrated, even my oversimplification could be simplified further.
But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us. Romans 5:8 (NASB)