function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2013', 3],
    ['1844', 3],
    ['1842', 2],
    ['1810', 1],
    ['1801', 1],
    ['1797', 3],
    ['1793', 5],
    ['1792', 11],
    ['1788', 2],
    ['1782', 1],
    ['1774', 1],
    ['1770', 3],
    ['1766', 7],
    ['1765', 1],
    ['1758', 30],
    ['Other (20)', 20]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=94)',
    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);