Add a transaction date to your data. Don't replace rows. Just add new ones as time goes on. You can use the transaction date to display booking progress over time (as well as month over month and any other cut of visualization you can think of.)
Thanks Joe. Could you please give me some guidelines how to add a transaction date to the data?
Add a field called TransactionDate.
When rows are added, have whatever data collection method you are using fill in that date.