function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 15],
    ['2020', 4],
    ['2019', 30],
    ['2017', 28],
    ['2016', 4],
    ['2015', 5],
    ['2014', 22],
    ['2008', 8],
    ['2000', 3],
    ['1994', 3],
    ['1959', 3],
    ['1924', 4],
    ['1923', 8],
    ['1922', 8],
    ['1902', 5],
    ['Other (16)', 27]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=177)',
    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);