function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2020', 39],
    ['2019', 19],
    ['2018', 102],
    ['2017', 72],
    ['2016', 108],
    ['2015', 174],
    ['2014', 35],
    ['2011', 26],
    ['2008', 48],
    ['2007', 47],
    ['2006', 33],
    ['2005', 24],
    ['2004', 36],
    ['2002', 25],
    ['2000', 33],
    ['Other (14)', 72]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=893)',
    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);