r - get_acs() 在提取人口普查块组时无法从 2012 年或之前的调查中获取数据

Question

我有一些代码（如下）可以很好地为 ACS 调查 2013/14/15/16/17 获取某个地理区域（亚特兰大如下示例）的人口普查块组数据。但是，当我在 2012 年或之前运行它时，我收到以下错误。

从 2008-2012 5 年 ACS 错误中获取数据：您的 API 调用有错误。返回的 API 消息是错误：未知/不支持的地理层次结构。

atl_counties <- c("Barrow",
                  "Bartow",
                  "Butts",
                  "Carroll",
                  "Cherokee",
                  "Clayton",
                  "Cobb",
                  "Coweta",
                  "Dawson",
                  "DeKalb",
                  "Douglas",
                  "Fayette",
                  "Forsyth",
                  "Fulton",
                  "Gwinnett",
                  "Haralson",
                  "Heard",
                  "Henry",
                  "Jasper",
                  "Lamar",
                  "Meriwether",
                  "Morgan",
                  "Newton",
                  "Paulding",
                  "Pickens",
                  "Pike",
                  "Rockdale",
                  "Spalding",
                  "Walton")

atl_vars_short <- c(
  total_pop = "B01003_001",
  median_income = "B19013_001",
  households = "B11001_001",
  housing_units = "B25001_001",
  agg_hh_income ="B19025_001"
)
# This works

cbg_data_atl_2013 <- get_acs(geography = "block group", 
                             variables = atl_vars_short, 
                             state ='GA', 
                             county = atl_counties, 
                             year = 2013,   
                             geometry = FALSE) 
# This does not work

cbg_data_atl_2012 <- get_acs(geography = "block group", 
                             variables = atl_vars_short, 
                             state ='GA', 
                             county = atl_counties, 
                             year = 2012,   
                             geometry = FALSE)