function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1817', 1],
    ['1806', 1],
    ['1805', 1],
    ['1794', 9],
    ['1791', 1],
    ['1787', 1],
    ['1781', 12],
    ['1780', 2],
    ['1778', 1],
    ['1776', 2],
    ['1775', 4],
    ['1767', 2],
    ['1764', 1],
    ['1763', 16],
    ['1761', 12],
    ['Other (3)', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=69)',
    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);