unable to take care of even the few roads the country had. By the early-to-mid-1980s, the Soviet authorities tried to solve the road problem by ordering the construction of new ones. Meanwhile, the automobile industry was growing at a faster rate than road construction. The underdeveloped road network led to a growing demand for public transport. Despite improvements, several aspects of the transport sector were still riddled with problems due to outdated infrastructure, lack of investment, corruption and bad decision-making. Soviet authorities were unable to meet the growing demand for transport infrastructure and services. The Soviet merchant navy was one of the largest in the world. Demographics Excess deaths throughout World War I and the Russian Civil War (including the postwar famine) amounted to a combined total of 18 million, some 10 million in the 1930s, and more than 26 million in 1941–1945. The postwar Soviet population was 45 to 50 million smaller than it would have been if pre-war demographic growth had continued. According to Catherine Merridale, ‘...reasonable estimate would place the total number of excess deaths for the whole period somewhere around 60 million.’ The birth rate of the USSR decreased from 44.0 per thousand in 1926 to 18.0 in 1974, mainly due to increasing urbanization and the rising average age of marriages. The mortality rate demonstrated a gradual decrease as well – from 23.7 per thousand in 1926 to 8.7 in 1974. In general, the birth rates of the southern republics in Transcaucasia and Central Asia were considerably higher than those in the northern parts of the Soviet Union, and in some cases even increased in the post–World War II period, a phenomenon partly attributed to slower rates of urbanization and traditionally earlier marriages in the southern republics. Soviet Europe moved towards sub-replacement fertility, while Soviet Central Asia continued to exhibit population growth well above replacement-level fertility. The late 1960s and the 1970s witnessed a reversal of the declining trajectory of the rate of mortality in the USSR, and was especially notable among men of working age, but was also prevalent in Russia and other predominantly Slavic areas of the country. An analysis of the official data from the late 1980s showed that after worsening in the late-1970s and the early 1980s, adult mortality began to improve again. The infant mortality rate increased from 24.7 in 1970 to 27.9 in 1974. Some researchers regarded the rise as