function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2015', 18],
    ['1908', 2],
    ['1905', 3],
    ['1887', 2],
    ['1883', 3],
    ['1873', 2],
    ['1872', 3],
    ['1861', 1],
    ['1860', 1],
    ['1855', 1],
    ['1854', 2],
    ['1853', 4],
    ['1846', 1],
    ['1840', 2],
    ['1812', 1],
    ['Other (16)', 16]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=62)',
    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);