function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2019', 6],
    ['2018', 2],
    ['2002', 5],
    ['1995', 2],
    ['1987', 4],
    ['1936', 3],
    ['1921', 2],
    ['1916', 10],
    ['1912', 6],
    ['1907', 10],
    ['1901', 2],
    ['1883', 6],
    ['1873', 6],
    ['1854', 2],
    ['1817', 1],
    ['Other (8)', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=75)',
    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);