I am trying to determine the statistical significant difference (or otherwise) between 2 series of data and am unsure how to proceed. It is rates of admission for arthritis between 2 countries.

Country A the average rate of increase per year is 8.1%, and for Country B the average rate of increase is 8.7% (both over 10 years). What test do I apply to determine whether this difference in rates is statistically significant?

Many thanks in advance