PIP: At the turn of the century, Taiwan's population was increasing slowly, then later grew during a period of high fertility after the end of World War II and the accordance of independence in 1946. This growth in fertility came together with increasing life expectancy and a general desire by couples to have families comprised of 5-6 children. Taiwan was therefore poised to experience a major population explosion. In this context, a family planning program was established in the country which has since evolved into one of the world's most successful such programs. By 1990, the preferred family size was 2-3 children and of couples which already had 2 children, 70% of those without any sons were nonetheless practicing contraception. While in 1965, no married women used contraception until they had some children, by 1990, 27% of married women without children used contraception. Increasing age at marriage has been an important factor in Taiwan's declining fertility, with the average age at marriage increasing from 20 years in the 1950s to approximately 27 in the 1970s. Few mothers, however, want only one child. The fertility trends observed in Taiwan have been made possible through the provision of contraception, which used to be universally free, but which is now provided free to only people of low income or the disabled. Oral contraception, condoms, and IUDs are used, although 30% of couples depend upon sterilization.