英文摘要
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The TFR (Total fertility rate) of Taiwan is the lowest in the world in 2010. In this study, we discuss the trend of fertility rate in recent 50 years, explore the difference between TFR and CFR (Cohort fertility rate), and predict the CFR of the 1968-1982 birth cohort female exquisitely. The summit of child-bearing age shifted gradually from 20-29 to 25-34 during 1950 to 2008 and its distribution changed from right skew to normal distribution after 1986. This postponed average child-bearing age for women is attributed to the rapid economics development of Taiwan causes the chance of women attending university and working opportunities increased. Piecewise regression method shows that the average child-bearing age is increased by 0.15 year per year, and it will reach 31.19 years old in 2020 if this trend keeps unchanged. Also, the trend of the coefficient of variation of child-bearing age concentrated in 30-34 years old in recent years. In addition, we use CFR data of 1933-1962 women birth cohort with Exponential and Grey model to project the CFR of 1973-1977 and 1978-1982 birth cohort are equal to 1.57 and 1.38 respectively. It is recommended that the most important issuses for the government is to encourage 1985-1995 birth cohort female to give birth and raise young during their child-bearing summit and maintained the fertility rate from 1.3 to 1.5 in the next 10 years.
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