You can use the following Cost of Gas calculator to estimate how much you are spending on gasoline in an average month from this it will estimate your average cost of gas per year as well.
South Africa Population growth rate. Factbook > Countries > South Africa > Demographics. Population growth rate: 0.99% (2016 est.) Definition: The average annual percent change in the population, resulting from a surplus (or deficit) of births over deaths and the balance of migrants entering and leaving a country. The rate may be positive or negative.
Population Growth Rate, Year ended 31 March 2015. 1  The preliminary estimated resident population (ERP) of Australia at 31 March 2015 was 23,714,300 people. 2  This reflects an increase of 316,000 people since 31 March 2014, and 93,900 people since 30 December 2014.