Aged 16-74. IUOLC, IUOLM -  learning activities over the internet for educational, professional or private purposes
  1 - Ticked
  0 - Not ticked
  9 - Not applicable (IU=Blank or IU ne 1)

Individuals Doing an online course
sum of IND_WGHT where (IUOLC=1 or IUOLM=1)