[R] Time series and ggplot2

[ashz]

Hi,

I made a time-series plot using ggplot. All the points are shown in the
graph but unfortunately it does not display all the months in the graph
X-axis text/labels but only one month per year. 

Furthermore, the data contain some NA as not all the month as Y values. 

Therefore, how can I display all the months in the X axis text/labels?
how can I display only January, April, July and October the months in the X
axis text/labels?

Thanks,
Ashz

PS
axis.text.x  = theme_text(angle=90)
and
scale_x_date(format = "%b-%Y")


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