function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1914', 2],
    ['1880', 2],
    ['1873', 2],
    ['1844', 1],
    ['1839', 1],
    ['1832', 1],
    ['1824', 1],
    ['1821', 1],
    ['1815', 2],
    ['1810', 2],
    ['1792', 1],
    ['1788', 2],
    ['1782', 1],
    ['1766', 1],
    ['1758', 9],
    ['Other (10)', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=39)',
    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);