function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 34],
    ['2017', 25],
    ['2015', 116],
    ['2013', 101],
    ['2012', 18],
    ['2011', 24],
    ['2009', 28],
    ['2008', 19],
    ['2007', 24],
    ['1989', 13],
    ['1988', 9],
    ['1986', 10],
    ['1984', 6],
    ['1978', 19],
    ['1948', 13],
    ['Other (5)', 13]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=472)',
    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);