1:Less than 12 months;2:Over 1 year but less than 2 years;3:Over 2 years but less than 3 years;4:Over 3 years but less than 4 years;5:Over 4 years but less than 5 years;6:Over 5 years but less than 7 Years;7:Over 8 years but less than 10 Years;8:Over 10 years but less than 12 Years;9:Over 12 years but less than 14 years;10:Over 14 years but less than 16 Years;11:Over 16 Years