The provided bar graph conspicuously depicts the details of different age groups of women who gave birth to their first baby in Australia from 1966 to 2006, with intervals of 20 years. From an overall perspective, it is readily apparent that throughout the period from 1966 to 2006, a minuscule percentage of first-child births were given by women over the age of 40.
There is empirical evidence to claim that in 1966 approximately 34% of females under the age of 19 delivered their first child. However, in 1986 and 2006, it dramatically decreased to 19% and 11%, respectively. 61% of women aged between 19 and 24 gave birth to their first child in 1966, but it gradually reduced to 30% in 1986 and 29% in 2006.
Females in the age group 25-30 showed a slight increment up to 50% in 1986 from 38%, but it again reduced to 39% in 2006. Moreover, in 1966, nearly 12% of ladies aged between 30 to 34 gave birth to their first child, and it gradually rose to approximately 19% in 1986 and approximately 45% in 2006.
Equivalent to the age 30-34 group, females in the age 34-39 group showed a gradual growth in first baby delivery. In 1966, it was 9%, but it increased to 15% in 1986 and exactly 30% in 2006. Women over the age of 40 contributed to a minuscule percentage of first births in all three years. In 1966, around 4% of women over the age of 40 gave birth to their first child, but it dropped to 3% in 1986. Again, the birth rate of the first child for women aged over 40 increased to 5% in 2006.