"Figure 2: Percentage of women remaining childless by their 30th birthday and completion of childbearing, by year of birth of woman, 1920 to 1987","" "England and Wales","" "","" "Notes","1. The 1944 cohort is assumed to be their mothers' generation because the average age of mothers giving birth in 1971 was 27 years, and so women of that age were assumed to be born in 1944." "Unit","Percentage" "","" "","By 30th birthday","By completion of childbearing" "","","" "","","" "1920","33","21" "1921","30","18" "1922","30","18" "1923","29","16" "1924","28","17" "1925","29","17" "1926","28","16" "1927","28","16" "1928","27","15" "1929","27","15" "1930","25","13" "1931","25","14" "1932","25","14" "1933","23","13" "1934","21","11" "1935","20","12" "1936","20","12" "1937","20","12" "1938","19","11" "1939","19","12" "1940","18","11" "1941","18","11" "1942","18","11" "1943","19","12" "1944","18","11" "1945","18","10" "1946","18","9" "1947","22","12" "1948","21","11" "1949","23","13" "1950","24","14" "1951","26","14" "1952","26","14" "1953","28","15" "1954","30","16" "1955","30","16" "1956","32","17" "1957","33","17" "1958","34","18" "1959","36","19" "1960","37","19" "1961","38","20" "1962","39","20" "1963","40","20" "1964","41","20" "1965","42","20" "1966","42","20" "1967","42","19" "1968","42","18" "1969","43","18" "1970","43","17" "1971","44","18" "1972","46","" "1973","47","" "1974","47","" "1975","48","" "1976","48","" "1977","47","" "1978","47","" "1979","46","" "1980","46","" "1981","45","" "1982","45","" "1983","46","" "1984","47","" "1985","47","" "1986","48","" "1987","47",""