lake size y1 y2 y3 y4 y5 1 1 23 4 2 2 8 1 0 7 0 1 3 5 2 1 5 11 1 0 3 2 0 13 8 6 1 0 3 1 5 11 2 1 5 3 0 8 7 6 3 5 4 1 16 19 1 2 3 4 0 17 1 0 1 3