function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 15],
    ['2020', 17],
    ['2019', 9],
    ['2018', 12],
    ['2016', 23],
    ['2014', 11],
    ['2012', 14],
    ['2011', 17],
    ['1909', 9],
    ['1885', 56],
    ['1837', 31],
    ['1836', 8],
    ['1817', 11],
    ['1798', 21],
    ['1758', 109],
    ['Other (36)', 88]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=451)',
    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);