According to Nielsen for the month of June 2020, compared to June 2019. Monsters retail market share in value increased in Argentina from 25.4% to 39.4%; in Brazil from 21.1% to 30.4%; and in Chile from 37.4% to 44.9%. Since the launch of Monster Energy in Argentina in the first quarter of 2018, Monster is now the leading energy brand in volume in Argentina.
Gross profit of the same period in 2019, gross profit in this region as a percentage of net sales was 41.2% compared to 43.3% of the same period in 2019. In Brazil, net sales in the quarter decreased by 1% in dollars, but increased 31.2% in local currency. Net sales in Chile increased 30.8% in dollars and 62.3% in local currency in the quarter.
In conclusion, I would like to summarize some recent positive points. One, the company's priority has been and remains the health and safety of our employees. Two, currently the company's flavor manufacturing facility, its co-packers, warehouses and shipping facilities and bottlers and distributors are all operating. Three, we are pleased with the new additions to the Monster Energy portfolio. Four, we're encouraged by the prospects for our Reign Total Body Fuel high performance energy drinks and Reign Inferno thermogenic fuel high performance energy drinks. We are planning for future launches of our Reign Total Body Fuel high performance energy drinks in certain countries outside of the US.
Five, we are pleased with the rollout of Predator and Fury and our affordable energy drink portfolio internationally. We are proceeding with plans for future launches of our affordable energy brands outside of the United States. Six, despite the obstacles of the COVID-19 pandemic, we are pleased with our performance for the quarter and for the first half of the year.
