function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 27],
    ['2021', 89],
    ['2020', 13],
    ['2016', 22],
    ['1983', 13],
    ['1957', 16],
    ['1935', 12],
    ['1934', 9],
    ['1929', 23],
    ['1922', 23],
    ['1916', 9],
    ['1913', 35],
    ['1912', 11],
    ['1911', 12],
    ['1906', 9],
    ['Other (33)', 88]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=411)',
    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);