If you drink 5 ounces of wine per day in a year, you would just have to simply multiply the amount of calories with the number of days in a year. A year has 365 days, So,

100 calories/day × 365 days = 36,500 calories

According to McGraw-Hill, a pound of body fat is equal to 3500 calories. Thus,

36,500 calories × (1 pound / 3500 calories) = 10.4 lbs

Thus, you will gain 10.4 pounds.