You can weight 108 kg (238 lbs) instead of 100 (220 lbs) for a BMI of 25 (top of the normal range). 18 lbs is quite a lot of difference, even at that weight. I stand at 198 cm's and hit 238 lbs last summer. At that point I had very little belly fat - 220 lbs would probably get me close to visible abs (the top few at least), which I don't think should be the top of the "normal" category.