function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 16],
    ['2010', 5],
    ['2002', 2],
    ['1987', 3],
    ['1974', 3],
    ['1970', 5],
    ['1965', 3],
    ['1963', 8],
    ['1961', 3],
    ['1957', 4],
    ['1953', 2],
    ['1942', 3],
    ['1940', 2],
    ['1928', 3],
    ['1919', 2],
    ['Other (33)', 34]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=98)',
    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);