From Fitday, which is based on the USDA nutrient database:

Broccoli, raw

Amount Per 8 cup, flowerets
Calories 159.04
Calories from Fat 17.89

% Daily Value *
Total Fat 1.99g 3%
Saturated Fat 0.307g 2%
Polyunsaturated Fat 0.949g
Monounsaturated Fat 0.136g
Cholesterol 0mg 0%
Sodium 153.36mg 6%
Potassium 1846mg 53%
Total Carbohydrate 29.76g 10%
Dietary Fiber 17.04g 68%
Protein 16.93g 34%

29g total - 17g fiber = 12g net. Don't know where you're getting the 63g figure from, but I figure the USDA is pretty authoritative . All other figures are also from Fitday's USDA front-end -- I used to use the actual USDA site, but they changed the format and quit printing fiber counts.