The bar chart illustrates the proportion of women in Australia give birth to their first child which divide into 5 age group between 1966 and 2006.
Overall, women aged 34 to 39 were a significant upward trend during the whole period. While the people fell into the 34 to 39 age group climbed overtime, the opposite was true for individuals aged 20 to 24, decreasing constantly from 1966 to 2006.
At the first glance, it is evident that women aged 19 and under dipped slightly from roughly 36% to below 13% during 40 years. In addition, people aged 20 to 29 peaked at nearly 70%, which was a considerable decline to half in 2006. Above 40% gave birth to their first child which remained stable over the period (around 42 to 46%).
In contrast, starting at 14% in 1966, the ratio of women 30 to 34 years old increased slightly prior to soaring to 54% in 2006. This data for people aged 34 to 39 and 40 plus gave birth to their first child were generally climbed about 30% and 5% correspondingly. 
The bar chart illustrates the proportion of  
women
 in Australia give birth to their  
first
 child which divide into 5 age group between 1966 and 2006. 
Overall
,  
women
  aged
 34 to 39 were a significant upward trend during the whole period. While the  
people
 fell into the 34 to 39 age group climbed overtime, the opposite was true for individuals  
aged
 20 to 24, decreasing  
constantly
 from 1966 to 2006.
At the  
first
 glance, it is evident that  
women
  aged
 19 and under dipped  
slightly
 from roughly 36% to below 13% during 40 years.  
In addition
,  
people
  aged
 20 to 29 peaked at  
nearly
 70%, which was a considerable decline to half in 2006. Above 40% gave birth to their  
first
 child which remained stable over the period (around 42 to 46%). 
In contrast
, starting at 14% in 1966, the ratio of  
women
 30 to 34 years  
old
 increased  
slightly
 prior to soaring to 54% in 2006. This data for  
people
  aged
 34 to 39 and 40 plus gave birth to their  
first
 child were  
generally
 climbed about 30% and 5%  
correspondingly
.