Dear R helpers,

I am currently having hard time fixing the values on the x-axis of a plot
with ggplot: even though I have 12 years, ggplot plots only 3 of them.
Here is my example:

library(ggplot2)
ii <- 2000:2011
ss <- rnorm(12,0,1)
pm <- data.frame(ii,ss)
tmpplot <- ggplot(pm, aes(x = ii, y = ss))
plot <- tmpplot + geom_line()
plot

In my case, ggplot reports on the year 2000, 2004 and 2008 on the x-axis,
but I'd like to have all the years from 2000 to 2011. I know how to fix
this with the standard plot in R, but for consistency I'd like to use
ggplot.
Can anyone help?
thanks in advance,
f.

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