Two numbers from the USDA:

- Canned, drained and rinsed: 7g protein / 100g [1]

- Boiled: 9g protein / 100g [2]

Not sure what explains the discrepancy (though the second number is much older), but both are considerably higher than what your can says. Sure you aren't reading a per-serving amount?

[1]: https://fdc.nal.usda.gov/food-details/2644288/nutrients

[2]: https://fdc.nal.usda.gov/food-details/173757/nutrients