ID	weightbefore	weightafter
1	21.1	20.0
2	21.0	26.2
3	20.2	21.0
4	20.3	26.0
5	30.0	29.5
6	31.0	31.1
7	25.0	30.1
8	33.5	30.0
11	20.5	26.0
12	20.4	26.0
13	20.2	26.0
14	21.0	26.0
15	30.8	31.0
16	29.5	29.1
17	30.0	27.0
18	34.2	34.0
19	27.0	26.0
20	28.0	32.0