function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 25],
    ['2020', 97],
    ['2017', 10],
    ['2014', 81],
    ['2012', 8],
    ['2010', 26],
    ['1999', 15],
    ['1980', 7],
    ['1920', 30],
    ['1916', 8],
    ['1913', 10],
    ['1912', 19],
    ['1897', 12],
    ['1887', 7],
    ['1878', 20],
    ['Other (72)', 168]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=543)',
    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);