9-12 MONTHS 1 12-18 MONTHS 1 18-24 MONTHS 2 2 YEARS 2 3 YEARS 1 4 YEARS 1 5 YEARS 3 6 YEARS 3 7 YEARS 4 8 YEARS 4 9 YEARS 3 10 YEARS 3 11 YEARS 4 12 YEARS 4 13 YEARS 4 14 YEARS 2 15 YEARS 2 16 YEARS 2