function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 8],
    ['2020', 10],
    ['2019', 12],
    ['2018', 8],
    ['2013', 4],
    ['2009', 4],
    ['2005', 4],
    ['1998', 4],
    ['1994', 10],
    ['1989', 2],
    ['1979', 3],
    ['1929', 2],
    ['1910', 4],
    ['1831', 6],
    ['1822', 6],
    ['Other (28)', 33]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=120)',
    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);