title: matplotlib not displaying all axis values
body: <p>I have a small program that is plotting some data.  The program runs without any errors and displays the plot, but it is removing every other x-axis value.  What should I be doing to get all twelve axis labels to display properly?</p>
  
  <p>The program:</p>
  
  <pre><code>import pandas as pd
  import numpy as np
  import matplotlib.pyplot as plt
  from pandas.plotting import register_matplotlib_converters
  
  print('NumPy: {}'.format(np.__version__))
  print('Pandas: {}'.format(pd.__version__))
  print('-----')
  
  display_settings = {
      'max_columns': 14,
      'expand_frame_repr': False,  # Wrap to multiple pages
      'max_rows': 50,
      'show_dimensions': False
  }
  pd.options.display.float_format = '{:,.2f}'.format
  
  for op, value in display_settings.items():
      pd.set_option("display.{}".format(op), value)
  
  file = "e:\\python\\dataquest\\unrate.csv"
  unrate = pd.read_csv(file)
  print(unrate.shape, '\n')
  
  unrate['DATE'] = pd.to_datetime(unrate['DATE'])
  print(unrate.info(), '\n')
  print(unrate.head(12), '\n')
  
  register_matplotlib_converters()
  plt.xticks(rotation=90)
  plt.plot(unrate['DATE'][0:12], unrate['VALUE'][0:12])
  plt.show()
  </code></pre>
  
  <p>I am getting as output:  (I am using PyCharm)</p>
  
  <p><a href="https://i.stack.imgur.com/f0dBX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/f0dBX.png" alt="enter image description here"></a></p>
  
  <p>I believe I should be getting: (From Dataquests built in IDE)</p>
  
  <p><a href="https://i.stack.imgur.com/zsRZY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zsRZY.png" alt="enter image description here"></a></p>