  For $g\in \mathbb{N}$, let $G=\Sp(2g,\mathbb{Z})$ be the integral symplectic
group and $S(g)$ be the set of all positive integers which can occur as the
order of an element in $G$. In this paper, we show that $S(g)$ is a bounded
subset of $\mathbb{R}$ for all positive integers $g$. We also study the growth
of the functions $f(g)=|S(g)|$, and $h(g)=max\{m\in \mathbb{N}\mid m\in S(g)\}$
and show that they have at least exponential growth.
