function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2019', 34],
    ['2014', 4],
    ['2010', 5],
    ['1973', 5],
    ['1941', 2],
    ['1938', 4],
    ['1928', 2],
    ['1927', 2],
    ['1918', 3],
    ['1913', 2],
    ['1911', 2],
    ['1876', 2],
    ['1857', 3],
    ['1836', 3],
    ['1758', 21],
    ['Other (31)', 34]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=128)',
    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);