There is a number of indicators to measure the growth of the economy, among them the most important are:
GDP:
Gross Domestic Product. it measures the value of all the goods and services produced in the country.
Because some of the GDP can come from a foreign-owned companies, people also introduced:
GNP: Gross National product, measuring the value of produce by a country (whether in or abroad)
Some other indicators are:
Unemployment Rate
and the rate of inflation