The interviews for the sample survey of industrial and service firms with 20 employees and over for the year 2006 were conducted in February and March 2007.
The sample consists of 3,109 industrial firms, excluding construction, 473 construction companies and 1,143 non-financial private service firms, representing 8.3, 6.1 and 4.1 per cent of the respective total reference populations. Because of the bigger sampling fraction of large firms, the three samples account for respectively 28.1, 19.3 and 17.2 per cent of payroll employment in the reference populations, which in turn represent a very substantial share of the sectoral aggregates.
