function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2016', 6],
    ['2014', 8],
    ['2007', 12],
    ['1970', 5],
    ['1967', 4],
    ['1958', 4],
    ['1937', 5],
    ['1913', 7],
    ['1881', 4],
    ['1880', 6],
    ['1838', 12],
    ['1810', 7],
    ['1801', 4],
    ['1775', 8],
    ['1758', 11],
    ['Other (69)', 96]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=199)',
    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);