By Clare Nuttall in Glasgow Four Central and Southeast European countries — Albania, Bosnia & Herzegovina, Lithuania and Moldova — along with the Caribbean island of Puerto Rico are set to suffer the world’s steepest declines in population relative to their size over the next three decades, according to the UN World Population Prospects 2024 projections. Looking further ahead, the severest contraction in population is projected for Ukraine by the end of the century, with the country’s population expected to contract by as much as 60%. The projected population decline in the Central, Eastern an…