Empty category in box plot

df <- data.frame(length=1:100,
                 year=c(rep(1980, 20), rep(1981, 20), rep(1983, 20), rep(1984, 20), rep(1985, 20)))
boxplot(length ~ year, df)



# Not good !

df$year <- factor(df$year,  levels = 1980:1985)
boxplot(length ~ year, df)


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