function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 20],
    ['2019', 16],
    ['2014', 83],
    ['2002', 6],
    ['2001', 12],
    ['1985', 7],
    ['1983', 11],
    ['1941', 5],
    ['1934', 7],
    ['1933', 13],
    ['1930', 64],
    ['1929', 15],
    ['1927', 11],
    ['1923', 6],
    ['1913', 5],
    ['Other (54)', 100]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=381)',
    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);