state system to cover the sheriff's department, district attorney, and other small groups covered underyou also have cost the cits to pay into social security. these are all cost you have to pay for and i realize you're dealing with a difficult budget, but those are not costs being caused by the san francisco retirement system and wanted to take this opportunity to highlight that and amplify that. supervisor chu: just to comment on the five-years moving -- the idea is we don't and absorb entire losses in one year right after if we were to have to absorb the cost of a 20% or 25% loss in one given year. the contribution rates would spike up exponentially and it would be difficult for the city to manage. the idea is to smooth out any loss or gain over five years so you don't take a hit at one time. that's the general idea of with a five-year smoothing policy is. with regards to the contribution rates, we often talk about the time when the city was contributing zero as required by the actuarial studies. but because of a proposition that was recently passed, that's not going to be that policy o