function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 1],
    ['2010', 1],
    ['2007', 1],
    ['1983', 9],
    ['1951', 8],
    ['1942', 5],
    ['1939', 1],
    ['1938', 10],
    ['1920', 27],
    ['1917', 2],
    ['1916', 5],
    ['1910', 2],
    ['1878', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=82)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerYear', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerYear'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerYear);