function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 5],
    ['2019', 27],
    ['2010', 11],
    ['2008', 11],
    ['1991', 6],
    ['1988', 5],
    ['1978', 5],
    ['1973', 9],
    ['1969', 10],
    ['1967', 11],
    ['1960', 6],
    ['1926', 5],
    ['1922', 10],
    ['1894', 6],
    ['1864', 6],
    ['Other (63)', 116]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=249)',
    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);