Percentage Of Cells That Start With X If Corresponding Cells Have Data

I need to calculate the percentage of cells in one column that have data in them compared to those that do not. This is easy enough to do by itself but here's where it gets tricky for me. I need this percentage calculated only when cells in a different column contain data.

Here's the specifics. All of the row and column references are exactly what I'm looking to have in my worksheet. If A5:A200 contain any value then I want to know the % of the cells in F5:F200 that have a value in them compared to the same number in F5:F200 that contain no value. I would like the answer to show up in B2.

Part of the issue is that cells A5:A200 already have a formula in them so I think that would count as a value. The one thing that might help is the fact that A5:A200 values that I'm looking for ALWAYS start with TN so that could be used as the search function. The reason why I need to base it on a value in A5:A200 is that the sheet is blank until I enter data in the rows. I can't have the blank rows below the last data that I've entered on the sheet count towards the percentage that I'm looking for.

Basically it's a sheet that I enter installations and service calls on. The information always has a TN# associated with it. Which through a formula is automatically populated in the same row in the A column. I track the installation or service call and when it's completed I enter a completion date in the F column in the same row.

I am trying to be able to keep track of the percentage of jobs completed (completion date entered in column F) compared to incomplete (cells in column F that have no completion date) but it has to only look at rows that actually have information entered in them which I think should be done by column A. column D5:D200 is where I enter the main information and there is no formula entered in the cells in column D so if it's easier to base it on that column then that's fine.