ggplot year by year comparison

Question

I want to produce one plot comparing data obtained in different years. The goal is having 12 months on the x axis and drawing diffe

Answer 1

library(ggplot2)
# Sample data
data <- read.table(text = "Month             Marg            Fiscal.Year
                           2009-01-01        20904494        2009
                           2009-02-01        30904494        2009
                           2009-03-01        40904494        2009
                           2009-04-01        30904494        2009
                           2009-05-01        43301981        2009
                           2009-06-01        14004552        2009
                           2009-07-01        24004552        2009
                           2009-08-01        34004552        2009
                           2009-09-01        44004552        2009
                           2009-10-01        54004552        2009
                           2009-11-01        64004552        2009
                           2009-12-01        44004552        2009
                           2012-02-01        58343271        2012
                           2012-03-01        68343271        2012
                           2012-04-01        58343271        2012
                           2012-05-01        58343271        2012
                           2012-06-01        38723765        2012
                           2012-07-01        77246753        2012",
                   header=TRUE, sep="", nrows=18)
data$MonthN <- as.numeric(format(as.Date(data$Month),"%m")) # Month's number
data$Month  <- months(as.Date(data$Month), abbreviate=TRUE) # Month's abbr.

g <- ggplot(data = data, aes(x = MonthN, y = Marg, group = Fiscal.Year, colour=Fiscal.Year)) + 
     geom_line() +
     geom_point() +
     scale_x_discrete(breaks = data$MonthN, labels = data$Month)
g