function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 51],
    ['2019', 150],
    ['2014', 11],
    ['2010', 23],
    ['2008', 13],
    ['2004', 9],
    ['2002', 8],
    ['1991', 8],
    ['1973', 9],
    ['1969', 10],
    ['1967', 11],
    ['1941', 7],
    ['1929', 11],
    ['1928', 11],
    ['1922', 10],
    ['Other (120)', 323]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=665)',
    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);