function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 15],
    ['2019', 2],
    ['2016', 4],
    ['2014', 31],
    ['1980', 2],
    ['1979', 2],
    ['1951', 12],
    ['1934', 2],
    ['1927', 3],
    ['1911', 2],
    ['1909', 2],
    ['1897', 2],
    ['1896', 5],
    ['1883', 2],
    ['1878', 4],
    ['Other (37)', 38]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=128)',
    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);