function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 6],
    ['2018', 11],
    ['2013', 7],
    ['2010', 4],
    ['2005', 11],
    ['2003', 28],
    ['2002', 35],
    ['2000', 19],
    ['1801', 3],
    ['1792', 7],
    ['1781', 3],
    ['1775', 6],
    ['1763', 7],
    ['1761', 6],
    ['1758', 81],
    ['Other (15)', 24]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=258)',
    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);