title: ggplot percentages multiplied by 100
body: <p>I want to use ggplot to make a plot showing  percentages on the yaxis. 
  here's the data and code i used</p>
  
  <pre><code>data&lt;-"yrs.1.17 yrs.18.44 yrs.45.64 yrs.65.84 yrs.85.
  1     4.53     35.12     32.93     22.86    4.57
  2     4.01     34.74     34.19     22.71    4.34
  3     4.75     33.23     35.19     22.28    4.51
  4     4.60     34.04     36.93     20.70    3.56
  5     4.80     33.82     37.69     19.97    3.52
  6     4.30     35.09     37.08     19.83    3.65
  7     3.65     38.08     36.19     19.18    2.85
  8     3.72     38.11     36.10     19.22    2.86"
  
  mydata&lt;- read.table(text=data, header=TRUE)
  
  
  year&lt;-c(2006,2007,2008,2009,2010,2011,2012,2013)
  df&lt;-data.frame(year,mydata)
  library(ggplot2)
  library(reshape2)
  library(scales)
  newdf&lt;-melt(df,'year')
  ggplot(newdf,aes(x=year,y=value,group=variable,color=variable))+ geom_line(size=1)+
  scale_x_continuous(breaks=year)+xlab("Year")+scale_y_continuous(labels = percent,limits=c(1,50),breaks=seq(5,50,by=5))+ylab("Age groups")+
  geom_point(aes(shape=variable),size=3)+
  ggtitle("Age groups of people between 2006 and 2013")+
  theme(legend.title=element_blank(), legend.justification=c(0.6,0.6), legend.position=c(0.95,0.95), legend.text = element_text(size=9), 
  axis.text = element_text(size=9), axis.title = element_text(size=9), plot.title=element_text(size = 9))     
  </code></pre>
  
  <p>As you can see in the output the percentages are all multiplied by 100.  Is there a way to get the  correct percentages.<br>
  Thanks a lot.</p>