Milne had earlier pleaded guilty to dangerous driving, injuring with intent to cause grievous bodily harm and four charges of injuring with reckless disregard for safety.
The 21-year-old had initially been charged with attempted murder and threatening to kill but the Crown withdrew those charges as the case approached the scheduled trial in June.
It was in March last year that Milne attacked a Chinese-New Zealand family, including their two children aged 12 and 10, while they were enjoying a Sunday day of picking blueberries.
"We tried so hard to get away from you ... I am scared you will come to attack us again."
She said noises at night startle her and as she thinks about the attack every day she wonders if Milne would've stopped his attack if family had paid him some money.
"I still think that everything that happened is my fault because I suggested we go blueberry picking that day.
"The treat for our family was always our day trips, a happy time. We've not been for a family day out since the attack."
The family have considered New Zealand "our home", with the father saying "the fresh air, the friendly people made us feel safe".
"We had the blue sky, the white clouds and healthy children," the mother added.
The family were all taken to hospital, with the son taken to Starship Hospital by the Westpac Rescue Helicopter with an undisplaced fracture to his skull, a laceration to his scalp and a small subdural haematoma.
The mother of the family said in her statement that her son's personality has changed since the attack.
The family friend also suffered a fractured spine.
"It is quite extraordinary that nobody was more seriously injured," Justice Fitzgerald said.
When Milne was questioned by police he said he made further racial slurs.
He also said he presumed the family were on an "illegal visa" and "Asian mafia" who had spent "two days in the country".
Milne also told police he was "at boiling point" when he saw the family drive past him at the shops and that "any Asian in general [he] wanted to hurt".
When Milne rammed the car he said he thought, "someone's gonna come out of it dead" and "this is it ... if they wanna kill me, let them kill me".
He also admitted he "felt like killing" the father of the family and wanted to "grab his neck and strangle him".
Crown prosecutor Jasper Rhodes has said the incident was a "very serious racial motivated attack on a family".
"This is not simply a case of road rage," he said today.
Rhodes added Milne's racial remarks showed what was "essential to his beliefs".