function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1939', 1],
    ['1938', 1],
    ['1930', 1],
    ['1923', 1],
    ['1922', 1],
    ['1920', 1],
    ['1914', 1],
    ['1912', 1],
    ['1903', 1],
    ['1902', 2],
    ['1860', 1],
    ['1857', 1],
    ['1855', 1],
    ['1854', 1],
    ['1851', 1],
    ['Other (3)', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerYear', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerYear'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerYear);