I hope you don't mind but I would plead with you not to compare like this. Please don't do this to yourself. It can only dissapoint you or others who have a lower weekly average. It really means nothing because as you get further out it changes and lowers as you get closer to goal. Also some people who have lots to lose will drop massive amounts in the first 3-6 months giving others unreasonable expectations. Also remember that if any male losers chime in you CANNOT compare them to the female losers as they lose a significantly higher rate again allowing for unreasonable expectations.
Age, health conditions, starting BMI, fitness pre-op, gender, previous dieting history and amount of compliance to guidelines all have an impact on the rate of weight loss so PLEASE DON'T COMPARE. It always seems to end in tears for someone.
Sorry to go on, just ignore me if you like as this is only my opinion and you have the right to your own

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Nic