Question: CurveFitting for 101 points

I have 101 point with very low value

and I'm trying to get the best curve that fits that points. I have tryed with a polynomial interpolator but the curve is not very good. I have also tried with an exponential but an error ocurrs. 

Error, (in Statistics:-ExponentialFit) dependent values must evaluate to positive numbers

 

Can anyone help me? Any ideas? How can I find the best curve fitting?

 

Thanks.

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