function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 12],
    ['2015', 6],
    ['2014', 6],
    ['2010', 5],
    ['2009', 6],
    ['2007', 22],
    ['2006', 10],
    ['1981', 5],
    ['1978', 7],
    ['1977', 9],
    ['1976', 6],
    ['1971', 3],
    ['1968', 5],
    ['1936', 3],
    ['1935', 3],
    ['Other (43)', 68]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=176)',
    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);