is this really correct ? 
Yes, it is correct. The base currency in this case is JPY. Originally, USD/JPY=0.008547. Later, USD/JPY=0.00813. As the exchange rate decrease, this means JPY has depreciated against the USD, and the change is -4.9%
is this really correct ?
Yes, it is correct. The base currency in this case is JPY. Originally, USD/JPY=0.008547. Later, USD/JPY=0.00813. As the exchange rate decrease, this means JPY has depreciated against the USD, and the change is -4.9%