What is a question about this article? If the question is unanswerable, say "unanswerable".

St. John's has traditionally been one of the safest cities in Canada to live; however, in recent years crime in the city has steadily increased. While nationally crime decreased by 4% in 2009, the total crime rate in St. John's saw an increase of 4%. During this same time violent crime in the city decreased 6%, compared to a 1% decrease nationally. In 2010 the total crime severity index for the city was 101.9, an increase of 10% from 2009 and 19.2% above the national average. The violent crime severity index was 90.1, an increase of 29% from 2009 and 1.2% above the national average. St. John's had the seventh-highest metropolitan crime index and twelfth-highest metropolitan violent crime index in the country in 2010.

What decreased by 4% in St. John's?
unanswerable