The given bar chart demonstrates the amount of females giving birth to their first baby in Australia in 1966, 1986, and 2006.
From the data provided in the bar chart, we can see that women who were 19-24 years old had the highest percentage of giving birth in 1966 out of the three years. However, over 40 had the lowest share throughout the period.
In 1966, 19-24 aged made up the largest portion of giving birth, which stood at over 60%, where this figure consistently dropped the remain of the period. Similarly, under 19 tend to same pattern over all 40 years and decreased from approximately 32% in 1966 to 10% in 2006. On the other hand, between 25-30 aged witnessed a significant fluctuations and peaked at 50% in 1986.
The remain ages groups had lower birth range in 1966 and 1986 compared to the other groups whereas 30-34 aged group experineced dramatically increase in 2006, and peaked at about 45%. Also, according to the data we can say that this groups had the highest share of giving birth in 2006 out of the six categories. Additionally, the other age groups (34-39 and over 40) rose in 2006 compared to the other years and 30-34 aged increased dramatically from approximately 9% in 1966 to 30% in 2006, and over 40 age groups witnessed a modest increase to around 5%.