function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 30],
    ['2021', 48],
    ['2020', 19],
    ['2019', 39],
    ['2018', 42],
    ['2017', 25],
    ['2016', 75],
    ['2015', 27],
    ['2014', 82],
    ['2013', 41],
    ['2012', 35],
    ['2011', 22],
    ['2009', 98],
    ['2008', 53],
    ['2004', 19],
    ['Other (16)', 31]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=686)',
    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);