function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 4],
    ['2020', 12],
    ['2017', 9],
    ['2016', 6],
    ['2014', 18],
    ['2010', 6],
    ['2008', 8],
    ['1993', 4],
    ['1991', 9],
    ['1989', 3],
    ['1988', 3],
    ['1931', 10],
    ['1924', 4],
    ['1921', 3],
    ['1854', 5],
    ['Other (36)', 46]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=150)',
    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);