A 2.0 g sample containing ${\mathrm{MnO}}_2$ is treated with HCl liberating ${\mathrm{Cl}}_2$. The ${\mathrm{Cl}}_2$ gas is passed into a solution of KI and 60.0 mL of $0.1\mathrm{M}{\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is required to titrate the liberated iodine. The percentage of ${\mathrm{MnO}}_2$ in the sample is______. (Nearest integer)

$\text{[Atomic masses (in u) }\mathrm{Mn}=55; \mathrm{Cl}=35.5; \mathrm{O}=16; \mathrm{I}=127; \mathrm{Na}=23; \mathrm{K}=39; \mathrm{S}=32]$