Starting April 16th, 2020, Emergency Situation Surcharge (ESS) has been applied in addition to the Fuel Surcharge, and The current ESS rate is 10.00%
As a result, the total surcharge rate including Fuel Surcharge and ESS from September 1st, 2022 - September 30th, 2022 is 20.00%.
Please see here for updated ESS details.
As for the total surcharge rate from October 1st, 2022 - October 31st, 2022 will be 19.75%.

Month Fuel Surcharge(%)
October, 2022 9.75%
September, 2022 10.00%
August, 2022 11.75%

The Fuel Surcharge is applied to shipping (freight) rate only. When Online discount applied, it will be apllied to the rate after discounted.

Fuel Surcharge(FSC) changes based on the U.S. GULF COAST (USGC) price for Kerosene-Type Jet Fuel is reported by The U.S. Energy Information Administration (EIA). Yamato uses the monthly average from the period two months prior to calculate the applicable fuel surcharge percentage. For example, the Fuel Surcharge for July 2018 Fuel Surcharge is based on the Fuel Surcharge for May 2018 EIA published rate. The rate is subject to change every month. Changes to the surcharge will be posted on website two weeks prior to the effective date.
EIA Website: http://www.eia.gov/dnav/pet/pet_pri_spt_s1_m.htm
* Yamato Transport USA uses round up thousandth to apply for the index.