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