function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 75],
    ['2020', 207],
    ['2019', 614],
    ['2018', 151],
    ['2017', 129],
    ['2016', 467],
    ['2015', 168],
    ['2014', 45],
    ['2013', 91],
    ['2012', 53],
    ['2010', 99],
    ['2009', 84],
    ['2008', 54],
    ['2007', 47],
    ['2006', 48],
    ['Other (43)', 183]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=2515)',
    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);