function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 75],
    ['2020', 12],
    ['2014', 6],
    ['2012', 7],
    ['2006', 19],
    ['2005', 9],
    ['1999', 6],
    ['1995', 7],
    ['1989', 6],
    ['1985', 6],
    ['1977', 7],
    ['1955', 6],
    ['1937', 7],
    ['1935', 9],
    ['1883', 5],
    ['Other (75)', 139]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=326)',
    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);