apsclean: Annual Population Survey Data Wrangling

#' Monthly Consumer Price Index
#'
#' aps_cpi returns the CPI inflation index on a monthly basis (currently set to
#' re-base the index to December 2019, the most recent month) - data are obtained from the
#' \href{https://www.ons.gov.uk/economy/inflationandpriceindices/timeseries/l55o/mm23/ }{ONS website}
#' last accessed 16/06/2020.
#'
#' @format A data frame with 72 observations and 3 variables.
#' \describe{
#'     \item{year}{}
#'     \item{month}{}
#'     \item{cpi_value}{}
#' }
"aps_cpi"