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While you have the hurdle of differentiating source of leads you need to start with a baseline - look at the numbers by month for the past couple of years and then you can see the growth month over month and asign a good portion of that to your efforts if you are maintaining the spends used previously.

If you have dropped some advertising you should note that and what leads it brought in - there will be seasonal shifts like late winter that may skew results but having a baseline is needed.

Creating separate phone numbers is key and using Google's Click to Call can help track part of that.