text: """
  Natural Disasters
  -----------------
  This example shows a visualization of global deaths from natural disasters.
  """
  
  import altair as alt
  from altair.expr import datum
  from vega_datasets import data
  
  source = data.disasters.url
  
  alt.Chart(source).mark_circle(
      opacity=0.8,
      stroke='black',
      strokeWidth=1
  ).encode(
      alt.X('Year:O', axis=alt.Axis(labelAngle=0)),
      alt.Y('Entity:N'),
      alt.Size('Deaths:Q',
          scale=alt.Scale(range=[0, 5000]),
          legend=alt.Legend(title='Annual Global Deaths')
      ),
      alt.Color('Entity:N', legend=None)
  ).properties(
      width=480,
      height=350
  ).transform_filter(
      datum.Entity != 'All natural disasters'
  )
  