function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1883', 4],
    ['1882', 2],
    ['1869', 2],
    ['1860', 2],
    ['1859', 1],
    ['1857', 2],
    ['1855', 1],
    ['1854', 1],
    ['1852', 3],
    ['1849', 4],
    ['1846', 1],
    ['1843', 1],
    ['1842', 1],
    ['1831', 1],
    ['1829', 1],
    ['Other (8)', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=35)',
    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);