title: Remove NA in R. (also in ggplot graph)
body: <p>My data looks like  </p>
  
  <pre><code>Year     ...  Growth_Rate
  2011             NA
  2012            2.0
  2013     ...    3.2
  2014            -2.0
  2015            1.3
  2016     ...    1.9
  
  
  ggplot(ridership, aes(Year, Bronx$Growth_Rate, group=1, na.rm=TRUE))+   
      geom_bar(stat= "identity", aes(fill=Year)) +  
      scale_y_continuous("Ridership Growth Rate", 
      labels = percent_format())+ geom_point(col='black', size=0.7) + 
      geom_line(col='black', size=0.3) + 
      ggtitle("Ridership Change in Bronx") + 
      theme(plot.title = element_text(hjust = 0.5))  
  </code></pre>
  
  <p>This is the graph. I would like to remove Y2011  </p>
  
  <hr>
  
  <p><a href="https://i.stack.imgur.com/ChCWQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ChCWQ.png" alt="enter image description here"></a></p>