function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 39],
    ['2019', 11],
    ['2017', 7],
    ['2016', 22],
    ['2015', 4],
    ['2012', 12],
    ['2011', 9],
    ['2009', 6],
    ['2008', 14],
    ['2006', 11],
    ['2003', 41],
    ['2002', 8],
    ['1886', 8],
    ['1882', 3],
    ['1881', 31],
    ['Other (4)', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=232)',
    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);