function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 9],
    ['2020', 8],
    ['2018', 9],
    ['2016', 10],
    ['2015', 3],
    ['2014', 3],
    ['2013', 6],
    ['1912', 3],
    ['1887', 5],
    ['1871', 3],
    ['1835', 5],
    ['1810', 4],
    ['1792', 3],
    ['1788', 3],
    ['1758', 15],
    ['Other (39)', 49]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=138)',
    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);