The supplied bar chart represents data about females in different age that gave a birth to the first child in Australia in the year 1966, 1986 and 2006.

The supplied bar chart represents data about

females

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of different ages that gave birth to their first child in Australia in the year 1966, 1986 and 2006.

Overall

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,

women

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aged over 40 consisted of the least percentage that gave birth to their first child,

while

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females

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under 19 made up with stable proportion. Turning to the details of the chart, in 1966 over 30% of young girls aged under 19 gave childbirth,

however

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after two decades and in 2006 it decreased to 20% (1986) and 28% (approximately) in 2006.

Females

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aged 19-24 were uppermost among all periods in the year 1966 which composed over 60%. In the following, periods it rapidly dropped with proportions of 35% and under 30%. Getting back to the details,

women

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at the age of 25-30 gave birth to their first baby about 35%. In 1986 involved half

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of

women

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and following period it was 47% (about). Middle-aged

women

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(30-34, 34-39) in 1966 and 1986 were less than 20%. Adult

females

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above 40 composed lower than 7% (approximately).