function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2015', 34],
    ['2013', 4],
    ['2007', 2],
    ['2006', 2],
    ['1982', 2],
    ['1933', 6],
    ['1926', 4],
    ['1922', 6],
    ['1913', 2],
    ['1901', 4],
    ['1899', 1],
    ['1883', 2],
    ['1868', 8],
    ['1855', 1],
    ['1819', 5],
    ['Other (26)', 26]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=109)',
    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);