how much weight have i lost

07/12/09 16st 3lbs start weight
14/12/09 16st 3.5lbs
4/1/10 16st 5lbs
11/1/10 16st 7lbs-TOTM
18/1/10 16st 1lb
25/1/10 16st 1lb (sts)
1/2/10 15st 13lbs -2lbs

is it 4lbs or 8lbs

many thanks
 
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