wood trade for nonexistent countries

[martinbruckner]

For some reason, the CBS shows imports and exports of roundwood for countries like Russia for years, in which these countries did not exist. This occurs for Eastern European countries, but also for Myanmar, Congo, Laos and many other countries that appeared later (or disappeared).

[nk027]

This was related to the now commented:

# Fill < 1997 with 1997 (or not)
# fore_fill <- lapply(seq(years[1], 1996), function(x, data, obs) {
#   dt <- data[obs, ]
#   dt$year <- x
#   return(dt)
# }, data = fore, obs = which(fore[, year] == 1997))