Please review my essay

The chart below gives information about the number of social networking sites people used in Canada in 2014 and 2015.

Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

My essay:

The bar chart compares the usage of social networking sites by Canadians in 2014 and 2015, measured in terms of percentages. It divides people into six categories: those who used no sites, one, two, three, four and five sites.

In general, about half of Canadians mainly used either one social network or two whereas only a minority of them used more than four.

While slightly more than one in every five Canadians did not use any social networks in these two years, the rest of them did. Of these particular people, a negative correlation occurred: as the number of these sites increases, the relative amounts of people decrease, especially in those using two sites or more with a Pearson of approximately -2. The biggest overall decrease happened in the one site category, falling from 36% in 2014 to 28% in 2015. By contrast, the proportions for those using multiple sites marginally rose; in particular, rising the least in the two sites group, by only 1%, and the most in the three sites, by 4%.