function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 56],
    ['2019', 7],
    ['2016', 7],
    ['2015', 6],
    ['2014', 108],
    ['1997', 7],
    ['1978', 7],
    ['1965', 5],
    ['1951', 18],
    ['1937', 6],
    ['1936', 5],
    ['1934', 7],
    ['1896', 8],
    ['1883', 6],
    ['1878', 5],
    ['Other (99)', 187]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=445)',
    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);