I have a dataset of all cases of a specific disease, pemphigus, for 10 years and am using survey weights and the svy command to estimate the national prevalence. My variables are pemphigus and year. I'd like to find the difference in prevalence between 2005 and 2006 with a confidence interval. I have been able to find the prevalence of pemphigus per year with a corresponding confidence interval, but have not been able to find the difference between the years.

For example, I have found the following:
Year 1: 300 (95% CI 290-310)
Year 2: 100 (95% CI 80 - 120)

I would like to calculate the following (while still using svy command):
Year 1 - Year 2: 200 (95% CI 195 - 205) p-value = 0.01

Could anyone help with the coding?