What is the best way of counting rows in sql server?

Question

Hello everyone, I have a query that counts the total inserted rows in the SQL server. I added 1 to get the new row that should be inserted. See my query below:

SELECT COUNT(CustomerID) + 1
    FROM fmCustomer
    WHERE year(getLogs) = YEAR(GETDATE())

But, here is the weird thing that always happens:

 

As you can see, it jumps from 21-00251 to 21-00253. Any suggestions on how can I count total rows + 1? Thanks in advance.