Q. Population and demography: statistics

Go to Passport -> scroll over Consumers​​> Population.

Statista. Provides quick statistics.
 

Other free resources:

• UN Department of Economic and Social Affairs. Population
• UN Demographic and Social Statistics
• World Bank. World DataBank
• U.S. Census Bureau:
  International Database (world population estimates and projections)
  Related International Statistical Activities (links to governmental statistical agencies by country)

Spain:

• Spanish demographic data can also be found on the Instituto Nacional de Estadística (Spanish Statistical Office)