Exponential Decay Pattern

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I have the pattern below:

$$ \begin{array}{ll} age (years) & remainder \\\hline 0 & 100\% \\ 20 & 66.7\% \\ 100 & 50\% \\ 300 & 40\% \\ 1000 & 33.3\% \end{array} $$

I need an equation which indicates above decaying pattern.