function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2022', 23],
    ['2021', 134],
    ['2020', 23],
    ['2018', 34],
    ['2015', 80],
    ['2014', 77],
    ['2013', 63],
    ['2011', 29],
    ['2010', 100],
    ['2009', 30],
    ['2006', 30],
    ['2005', 35],
    ['2004', 23],
    ['2003', 116],
    ['2002', 22],
    ['Other (13)', 84]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=903)',
    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);