The bar chart compares six different age of women give the first birth in Australia in 1966, 1986, and 2006.
Overall, there were more than five age categories on their first childbirth. Accordingly, a first birth was higher in number of childbirth between twenty-five and twenty-nine ages in 1986 and 2006. However, the oldest age categories was the lowest than others in a three two decades.
In 1966, between in 20 and 24 ages category was the most popular age with just over 60% of diagram, however, this age category decreased by 20% in 1986 and in 2006, it was decreased by 10% than previous year. Additionally, 25 and 29 years category was popularly than others after two decades.
In a last year, the remaining older age categories have experienced a gradual increase. The proportion of those aged between 25-29, which was around 38% at first, rose markedly to 50% in 1986, before declining to over 40% again. Furthermore, the percentages of women from both 30-34 and 35-39 age groups increased by roughly 6% from 12% and 9% respectively in the middle of the period and reached their peaks of 50% and 30% in 2006. As for the share of women aged over 40 saw a negligible rise by 2% in each given period.