answer some basic questions about the economy

so, most people don't have any clue of scales involved with economy at large. let's play a game:

without looking it up, give estimates for the following:

• how many kg of concrete / steel are being produced per person per year (worldwide average)
• how many kg of cereals per person per year
• how many kWh of energy per person per year

• ---

• what’s the average population density for rural areas / cities?