Uber and Lyft drivers protested low pay this week. Here are the cities where their earnings have fallen the most.

• Uber and Lyft drivers staged a strike and protests around the world this week to call attention to their low pay.
• The JPMorgan Chase Institute, a think tank inside JPMorgan, recently published research on the gig economy.
• The group found that average revenue had changed wildly for drivers, depending on their city.
• While drivers in some cities saw their revenue increase from 2013 to 2018, many in other cities, such as Bridgeport, Connecticut, saw it fall dramatically, by as much as 87%.

Drivers for Uber and Lyft staged protests and work stoppages in cities around the world this week to protest falling pay on the ride-hailing platforms.

Both companies said they’re working to ensure drivers were paid fairly, but in many cases average pay has fallen quite a bit.

The JPMorgan Chase Institute, an economic think tank inside the US’s largest bank, JPMorgan, set out to quantify exactly how much – or how little – members of the gig economy were making in select locations.

“We use geographic and temporal variation to explore these dynamics in more detail in order to get a better understanding of the viability of the transportation and leasing sectors of the Online Platform Economy as a potential source of income for participant families,” the group of analysts said in their published report. “We explore variation in characteristics of the Online Platform Economy over five years across 27 metropolitan areas.”

Read more: 15 cities where Uber and Lyft drivers make the most money

The data shows that average monthly revenue mostly declined for drivers from 2013 to 2018, with analysts adding that their findings "fully account for the secular trends in driver revenues, even as participation shares shifted across metro areas."

20. Austin, Texas

2013 to 2018 net change: -6%

19. Portland, Oregon

2013 to 2018 net change: -21%

18. Chicago

2013 to 2018 net change: -23%

17. San Francisco

2013 to 2018 net change: -27%

16. San Jose, California

2013 to 2018 net change: -35%

15. New York City

2013 to 2018 net change: -36%

14. Seattle

2013 to 2018 net change: -43%

13. Detroit

2013 to 2018 net change: -43%

12. Columbus, Ohio

2013 to 2018 net change: -44%

11. Houston

2013 to 2018 net change: -45%

10. Los Angeles

2013 to 2018 net change: -54%

9. Denver

2013 to 2018 net change: -58%

8. Indianapolis

2013 to 2018 net change: -58%

7. Las Vegas

2013 to 2018 net change: -60%

6. San Diego

2013 to 2018 net change: -62%

5. Phoenix

2013 to 2018 net change: -69%

4. Miami

2013 to 2018 net change: -71%

3. Dallas

2013 to 2018 net change: -79%

2. Atlanta

2013 to 2018 net change: -80%

1. Bridgeport, Connecticut

2013 to 2018 net change: -87%