Comparison of prevalence over years

hi all
would you please help us how to approach this question
the research question is to study the trends in prevalence of an outcome over years. we have one time measurement of the dichotomous outcome for the last 10 years. how can we study the trends in period prevalence over the last 10 years. graphically we plot the year wise period prevalence. how can we model this. how to compare the prevalence across these years