value sample 31.2 a 58.2 a 55.1 a 59.0 a 48.9 a 44.0 a 75.0 a 56.4 a 43.1 a 48.3 a 53.3 a 48.1 a 48.6 a 43.1 a 57.6 a 55.2 a 55.7 a 37.8 a 29.1 a 55.3 a 36.1 a 49.6 a 65.9 a 60.4 a 39.1 a 54.4 a 51.8 a 48.6 a 41.5 a 42.2 a 34.3 b 45.3 b 19.7 b 6.6 b 13.0 b 17.0 b 35.8 b 26.3 b 36.6 b 34.0 b 32.5 b 40.4 b 29.7 b 23.6 b 22.2 b 54.7 b 27.6 b 38.3 b 15.1 b 24.6 b 21.5 b 17.5 b 33.9 b 14.4 b 22.3 b 23.6 b 41.7 b 18.0 b 48.4 b 20.7 b