Shadow economy - Country rankings:
The average for 2015 was 27.81 percent.The highest value was in Zimbabwe: 67 percent and the lowest value was in Switzerland: 6.94 percent. Below is a chart for all countries where data are available for: Shadow economy.
Definition: The shadow economy as percent of total annual GDP. Detailed methodology of the estimations can be obtained from the following International Monetary Fund working paper by Leandro Medina and Friedrich Schneider (2018): Shadow Economies Around the World: What Did We Learn Over the Last 20 Years?