yearcl age num meanret 91 2 175 13.7 90 3 273 16.9 89 4 28 9.6 88 5 79 47.7 87 6 18 19.5 86 7 49 49.5 85 8 21 31.0 84 9 8 9.6 83 10 0 10.5 82 11 2 23.2