Perhaps I'm missing something, but that seems like a National Crime Victimization Survey (NCVS). How does a recent downward trend at the national level tell you

Perhaps I'm missing something, but that seems like a National Crime Victimization Survey (NCVS). How does a recent downward trend at the national level tell you anything about crime in San Francisco which actually seems to have significantly more crime than the National average and a recently rising crime rate? https://www.cityrating.com/crime-statistics/california/san-francisco.html https://www.cityrating.com/crime-statistics/california/san-f...