Statistics can help improve your understanding of the issues involved in your case.
A few examples:
Are you researching a demonstration related to maternal health care? Use these resources to find the maternal mortality rate for your country. (try WDI Online)
Researching a protest related to gas prices in the US? Compare the average cost of gas in the US to other countries. (try Statista)
Finding more information about an anti-violence protest in Mexico? Look up the homicide rate in Mexico. (try UNdata)
These links point to just a few of the many resources offering statistics (and raw data). For a larger list, check out the Tri-Co Libraries Census and Statistics Guide. You can always ask a librarian for help finding stats and data (email Sarah at email@example.com).