\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepackage{pgf-pie}
\begin{document}
\begin{tikzpicture}
    \pie[text=pin, sum=auto]{
        31/jogging,
23/hiking,
18/biking,
17/camping,
15/fishing
    }
    \node [above=3mm, font=\large] at (current bounding box.north) {Outdoor activites by percentage};
\end{tikzpicture}
\end{document}