I don't see that on this page. I see "police killed at least 104 unarmed black people in 2015", and "unarmed black people were killed at 5x the rate of unarmed whites in 2015".

So I think that makes around 125-130 unarmed people killed by police. [1] says that there were 1,134 people killed that year by police.

125/1134 = 11%

[1] https://www.theguardian.com/us-news/2015/dec/31/the-counted-...