Bulgaria's has decreased in its birth rates since the 1970s, at a rate almost matched by those for Romania leading to inevitable declines in their populations. Yugoslavia retains a relatively higher birth rate.

The 'low point' for each country in the mid 1960s is in stark contrast with the 'flower power' period of the West. The numbers now in their 60s (born around 1940) reflect the devastating effect of the last War.

See how this affects the proportions of males to females