function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 49],
    ['2022', 8],
    ['2021', 28],
    ['2020', 22],
    ['2019', 38],
    ['2018', 19],
    ['2017', 68],
    ['2015', 39],
    ['2014', 35],
    ['2013', 21],
    ['2012', 10],
    ['2010', 20],
    ['2009', 38],
    ['2000', 23],
    ['1991', 8],
    ['Other (7)', 29]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=455)',
    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);