Economy Louisiana GDP tumbles 5.5% in 2020 By Deanna B. Narveson - March 26, 2021 FacebookTwitterLinkedinEmailPrint Louisiana’s gross domestic product dropped by 5.5% in 2020 when compared to 2019, a steeper drop than the rest of the country, which declined an average of 3.5%, according to the latest data from th… Already an INSIDER? Sign in.