This one pop up in my search
https://www.nerdsofgambling.com/top-gambling-countries-world/Article was last updated on August 2020 so I guess it's the most recent?
The article also added the preferred method and average loss per person.
1. France
- Preferred Gambling Source : Casinos
- Annual Gambling Loss Per Person : $350
2. USA
- Preferred Gambling Method : Sports Betting/ Casinos
- Annual Gambling Loss Per Person : $330
3. Monaco
- Preferred Gambling Method : Sports Betting / Casinos
- Annual Gambling Loss Per Person : $320
4. Singapore
- Preferred Gambling Method : Casinos / Football Betting / Lottery
- Annual Gambling Loss Per Person : $1100
5. Canada
- Preferred Gambling Method : Sports Betting / Lottery
- Annual Gambling Loss Per Person : $568
6. Australia
- Preferred Gambling Method : Sports Betting / Slot machines
- Annual Gambling Loss Per Person : $1288
7. Ireland
- Preferred Gambling Method : Sports Betting
- Annual Gambling Loss Per Person : $588
8. Greece
- Preferred Gambling Method : Sports Betting / Slots
- Annual Gambling Loss Per Person : $420
9. Spain
- Preferred Gambling Method : Sports Betting / Lottery
- Annual Gambling Loss Per Person : $418
10. Italy
- Preferred Gambling Method : Slots / Roulette / Baccarat
- Annual Gambling Loss Per Person : $517
I'm a bit surprised that Italians and the French don't bet much on sports knowing that it has football and basketball leagues.