Y X1 X2 6.1 43 9.2 7.1 55.3 12 7.4 48.5 10.4 6.3 38.8 9.8 6.5 46.2 9.8 5.7 39.9 7.7 6.6 43.1 10.9 8.1 48.5 9.5 6.3 40 11.6 6.9 56.7 11.6