function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 111],
    ['2020', 170],
    ['2019', 117],
    ['2017', 66],
    ['2016', 42],
    ['2015', 94],
    ['2014', 75],
    ['2013', 115],
    ['2012', 38],
    ['2011', 106],
    ['2010', 94],
    ['2009', 29],
    ['2008', 79],
    ['2007', 30],
    ['1960', 9],
    ['Other (9)', 28]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=1203)',
    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);