The NCB monthly report is an index compiled from a survey of manufacturing businesses. Any figure above 50 means activity grew.
The CSO figures are based on its residential property price index, which is adjusted to allow for the fact that different types of property are sold in different periods.
Gross Domestic Product (GDP) is the total value of all goods and services produced in an economy in a given time period.Gross National Product (GNP) is the total value of all goods and services produced in an economy in a given time period which accrues.