Due to continuously rising U.S. natural gas production, natural gas prices at the U.S. benchmark Henry Hub averaged US$2.57 per million British thermal units (MMBtu) in 2019—the lowest annual average price since 2016, the U.S. Energy Information Administration (EIA) said on Thursday. The average natural gas price last year was US$0.60 lower than the average Henry Hub price in 2018. Monthly average prices at the key U.S. regional trading hubs hit their highest in February 2019, due to the winter season, and then they were relatively…