function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 12],
    ['2017', 9],
    ['2008', 3],
    ['2007', 3],
    ['1942', 3],
    ['1880', 3],
    ['1877', 5],
    ['1870', 4],
    ['1860', 3],
    ['1859', 11],
    ['1858', 8],
    ['1829', 5],
    ['1823', 2],
    ['1822', 27],
    ['1819', 5],
    ['Other (48)', 61]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=164)',
    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);