The given graph illustrates the changes in the birth proportions of women in 6 types of age groups in the UK between 1973 and 2008.
Overall, while the birth rates of women from 30 to 35, and 35 to 39 increased slightly, the opposite was true for their counterparts. Moreover, despite a significant decline, birth cases among 25-29-year-olds commanded the largest figure over the given phase.
In 1973, females between 25 and 29 years old were recorded to take up the highest data, at 140 births per 1000 people, which then consistently declined to 120 cases in 2008. Meanwhile, standing at the lowest position was the over 40-year-old group with 20 birth rates per 1000 people in 1973, which halved to 10 cases in 2008. Likewise, the birth rates of the 20-25 and under 20 years old group also witnessed a slight decline from above 120 cases to 100 cases, and from 60 cases to 40 cases, respectively.
In contrast, the birth rates of those between 30-35 and 35-39 years old increases gradually from 70 cases to above 80 cases and from 40 cases to 60 cases, in the given order. With the slight growth, the number of women in the 35-39 age bracket surpassed the data of the under 20 age group, at nearly 50 cases, and reached 60 cases in 2008.