function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2019', 115],
    ['2017', 52],
    ['2016', 49],
    ['2014', 10],
    ['2013', 20],
    ['2010', 11],
    ['2009', 18],
    ['2008', 23],
    ['2005', 233],
    ['1993', 66],
    ['1982', 138],
    ['1939', 54],
    ['1905', 57],
    ['1878', 27],
    ['1851', 12],
    ['Other (16)', 60]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=945)',
    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);