function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1817', 22],
    ['1813', 92],
    ['1809', 28],
    ['1808', 28],
    ['1803', 29],
    ['1799', 69],
    ['1796', 71],
    ['1790', 32],
    ['1787', 15],
    ['1775', 339],
    ['1767', 59],
    ['1766', 34],
    ['1763', 23],
    ['1761', 50],
    ['1760', 55],
    ['Other (42)', 135]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=1081)',
    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);