function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 72],
    ['2002', 14],
    ['1941', 10],
    ['1938', 13],
    ['1937', 20],
    ['1905', 33],
    ['1903', 23],
    ['1902', 18],
    ['1900', 20],
    ['1899', 68],
    ['1897', 15],
    ['1895', 18],
    ['1880', 9],
    ['1879', 17],
    ['1842', 25],
    ['Other (68)', 200]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=575)',
    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);