yield    rain
21.7     6.8
26.8     6.9
30.1     7.7
19.4     7.8
35.5     8.0
27.5     8.7
29.9     8.7
34.9     9.3
29.7     9.3
35.0     9.4
30.5     9.5
35.2     9.5
24.5     9.6
27.9     9.9
36.4    10.0
29.9    10.1
30.2    10.1
32.0    10.1
32.6    10.4
32.4    10.6
36.7    10.7
34.0    10.8
36.9    11.0
38.0    11.3
36.9    11.5
38.3    11.6
31.7    11.6
32.3    12.0
30.5    12.1
35.2    12.1
31.9    12.5
33.7    12.9
36.8    13.0
31.5    13.6
26.8    13.9
30.2    14.1
36.0    16.2
33.3    16.5