Below is the hypothetical information of the balance of payment for the US.Export of merchandise 200Import of merchandise 500Export of services 80Import of services 55Unilateral transfer of fund (NET) -30Direct Foreign Investment received by the US 100Direct Foreign Investment made by the US 250Portfolio Investment received by the US 400Portfolio Investment made by the US 350Other Investment received by the US 600Other Investment made by the US 200Question: During this period, the Foreign Exchange Reserve of the USD change by