old_contents: """
  Global Deaths from Natural Disasters
  ------------------------------------
  This example shows a proportional symbols visualization of deaths from natural disasters by year and type.
  """
  # category: case studies
  import altair as alt
  from vega_datasets import data
  
  source = data.disasters.url
  
  alt.Chart(source).transform_filter(
      alt.datum.Entity != 'All natural disasters'
  ).mark_circle(
      opacity=0.8,
      stroke='black',
      strokeWidth=1,
      strokeOpacity=0.4
  ).encode(
      x=alt.X('Year:T', title=None, scale=alt.Scale(domain=['1899','2018'])),
      y=alt.Y(
          'Entity:N',
          sort=alt.EncodingSortField(field="Deaths", op="sum", order='descending'),
          title=None
      ),
      size=alt.Size('Deaths:Q',
          scale=alt.Scale(range=[0, 2500]),
          legend=alt.Legend(title='Deaths', clipHeight=30, format='s')
      ),
      color=alt.Color('Entity:N', legend=None),
      tooltip=["Entity:N", "Year:O", "Deaths:Q"]
  ).properties(
      width=450,
      height=320,
      title=alt.TitleParams(
          text="Global Deaths from Natural Disasters (1900-2017)",
          subtitle="The size of the bubble represents the total death count per year, by type of disaster",
          anchor='start'
      )
  ).configure_axis(
      domain=False,
      ticks=False,    
  ).configure_axisX(
      labelOverlap=True,
  ).configure_view(
      stroke=None
  )
  
new_contents: """
  Global Deaths from Natural Disasters
  ------------------------------------
  This example shows a proportional symbols visualization of deaths from natural disasters by year and type.
  """
  # category: case studies
  import altair as alt
  from vega_datasets import data
  
  source = data.disasters.url
  
  alt.Chart(source).transform_filter(
      alt.datum.Entity != 'All natural disasters'
  ).mark_circle(
      opacity=0.8,
      stroke='black',
      strokeWidth=1,
      strokeOpacity=0.4
  ).encode(
      x=alt.X('Year:T', title=None, scale=alt.Scale(domain=['1899','2018'])),
      y=alt.Y(
          'Entity:N',
          sort=alt.EncodingSortField(field="Deaths", op="sum", order='descending'),
          title=None
      ),
      size=alt.Size('Deaths:Q',
          scale=alt.Scale(range=[0, 2500]),
          legend=alt.Legend(title='Deaths', clipHeight=30, format='s')
      ),
      color=alt.Color('Entity:N', legend=None),
      tooltip=[
          "Entity:N", 
          alt.Tooltip("Year:T", format='%Y'), 
          alt.Tooltip("Deaths:Q", format='~s')
      ],
  ).properties(
      width=450,
      height=320,
      title=alt.TitleParams(
          text="Global Deaths from Natural Disasters (1900-2017)",
          subtitle="The size of the bubble represents the total death count per year, by type of disaster",
          anchor='start'
      )
  ).configure_axis(
      domain=False,
      ticks=False,    
  ).configure_axisX(
      labelOverlap=True,
  ).configure_view(
      stroke=None
  )
  
subject: Update altair/examples/natural_disasters.py