Statistics Canada says since 1998 there have been only three other occasions when a provincial increase of 10-percent or more was seen.
The Crime Severity Index measures the volume and severity of police-reported crime.
The numbers helped push the national index up 5-percent.
Higher numbers of break and enter were the main drivers of the high index in Saskatchewan.
The crime severity index of 135.8 was the highest among the provinces.
The crime rate in 2015 of 11,178 per 100 thousand population was also the highest of the provinces.
As has been the case since 2010, Saskatoon and Regina continue to be the two cities with the highest CSIs.
The index rose 2-percent in Saskatoon and 5-percent in Regina. Saskatoon’s crime rate is the highest of 33 census metropolitan areas surveyed at 8,427.
Regina is the third highest at 8,146.