time y 1 0.5 2 2.0 3 3.8 4 3.8 5 4.8 6 5.3 7 5.7 8 6.8 9 6.1 10 8.6 11 8.1 12 10.0 13 11.6 14 10.1 15 11.5 16 10.1 17 11.9 18 9.1 19 13.6 20 12.9 21 11.9