The following chart compares advancements and demotions by age range. 17.5% of advancements and 9.1% of demotions were by persons under 30 years of age. 37.8% of advancements and 33.8% of demotions were by persons between 30 to 39 years of age. 26.6% of advancements and 32.4% of demotions were by person between 40 to 49 years of age. 14.6% of advancements and 20.4% of demotions were by persons between 50 to 59 years of age. 3.5% of promotions and 4.3% of demotions were by persons over 59 years of age.