The time period of a pendulum is given by $\mathrm{T}=2 \pi \sqrt{\frac{l}{g}}$. The measured value of the length of pendulum is 10 cm known to a 1 mm accuracy. The time for 200 oscillations of the pendulum is found to be 100 second using a clock is 1 s resolution. The percentage accuracy in the determination of ' $g$ ' using this pendulum is ' $x$ '. The value of ' $x$ ' to the nearest integer is:-