Which manufacturing industry has the highest profit margin

From the comparative chart of changes in gross profit margins of China's manufacturing industry segments from 2016-2018 (current quarterly value),

the most profitable industry in China's manufacturing industry is currently the medical manufacturing industry

gross profit margins all the way up from 30% to 40% consistently; the other industry that continues to go up is the wine, beverages, and refined tea manufacturing industry, with gross profit going from 25% to 30% consistently .