About how much do Dogue De Bordeaux (French Mastiff)s gain from age 1 year to 2 years?

I have a 1 year old male Bordeaux and he weighs 100 pounds. I was wondering if anyone could tell me what they Bordeaux weighed at 1 year and what they did at 2 years? I'm trying to calculate an average percentage of weight gain over the year. Thanks for all your help!