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EDIT: As you state that your variables are in logs, you need to consider that averaging log values is not the same as taking averages and then logging. So, take this into account.
Many thanks for this. It really works. Can you tell me what to add if i want to keep let's say keep 10 years individually on x-axis like 2003, 2004, 2005 and so on till 2012.
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