function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 40],
    ['2022', 18],
    ['2021', 9],
    ['2020', 31],
    ['2019', 34],
    ['2018', 35],
    ['2017', 82],
    ['2016', 75],
    ['2015', 26],
    ['2013', 157],
    ['2010', 121],
    ['2009', 15],
    ['2008', 9],
    ['2002', 26],
    ['1973', 26],
    ['Other (11)', 29]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=733)',
    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);