function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1872', 3],
    ['1871', 3],
    ['1861', 2],
    ['1860', 2],
    ['1858', 2],
    ['1856', 5],
    ['1855', 5],
    ['1853', 6],
    ['1852', 4],
    ['1846', 2],
    ['1828', 6],
    ['1817', 4],
    ['1810', 3],
    ['1792', 2],
    ['1775', 3],
    ['Other (24)', 29]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=81)',
    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);