SYDNEY, July 25 (Xinhua) -- The number of Australian child abuse reports increased by 30 percent over a two year period, according to new figures from the Australian Institute of Health and Welfare (AIHW) released on Friday.

Neglect and emotional abuse were the most common primary types of abuse, according to AIHW spokesperson Dr Pamela Kinnear.

"Between 2010-11 and 2012-13, there was a 29 percent increase in the number of children who were the subject of substantiations, rising from 31,527 to 40,571," Kinnear said in a statement.

More than 135,000 Australian children received child protection services in 2012-13, the report said.

Children most at risk come from poorer backgrounds with 42 percent of abuse victims from the areas of lowest socioeconomic status.

The AIHW figures showed that indigenous children were at the highest risk, being eight times as likely as non-indigenous children to be receiving child protection services.

Emotional abuse accounted for 38 percent of substantiated cases, followed by neglect (28 percent), physical abuse (20 percent) and sexual abuse (13 percent).