In January 2013 I weighed 72kg .Then I gained a lot of weight and by January 2014 I weighed 81 kg .Then I went on a diet and regularly went to the gym.By January 2015 my weight was 76.5kg .By how much percentage did my weight increase during the first year and then decrease during the next year? What was the overall percentage change in weight over the two years?
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Inc -- increase ; dec -- decrease ; ∆ -- change
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