function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 61],
    ['2021', 74],
    ['2019', 87],
    ['2018', 47],
    ['2017', 56],
    ['2016', 50],
    ['2014', 94],
    ['2011', 82],
    ['2009', 73],
    ['2006', 517],
    ['2004', 181],
    ['2003', 47],
    ['2001', 198],
    ['1999', 48],
    ['1976', 61],
    ['Other (56)', 534]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=2210)',
    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);