function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 91],
    ['2022', 430],
    ['2021', 73],
    ['2020', 126],
    ['2019', 167],
    ['2018', 93],
    ['2017', 70],
    ['2015', 34],
    ['2012', 166],
    ['2011', 71],
    ['2009', 101],
    ['2007', 154],
    ['2006', 41],
    ['1921', 106],
    ['1920', 190],
    ['Other (18)', 151]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=2064)',
    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);