function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2016', 2],
    ['2013', 15],
    ['2010', 10],
    ['2004', 8],
    ['1987', 4],
    ['1981', 2],
    ['1972', 2],
    ['1936', 2],
    ['1922', 2],
    ['1917', 2],
    ['1912', 3],
    ['1909', 2],
    ['1906', 2],
    ['1902', 4],
    ['1899', 4],
    ['Other (25)', 26]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=90)',
    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);