Premium Bonds - If you post to say how much you've won, please also say how much you have invested.

4 draws so far, so one third of 12 months.

Of course for your own amusement you can extrapolate an annual rate of return. But clearly the fewer data points you have the more volatile the outcome, particularly if you have a large win one month or win nothing at all. Your actual annual percentage growth will only be known once you have been in for 12 monthly draws.
 
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