function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2019', 9],
    ['2016', 2],
    ['2014', 1],
    ['2013', 1],
    ['2009', 40],
    ['2005', 109],
    ['1993', 61],
    ['1982', 54],
    ['1864', 2],
    ['1842', 1],
    ['1822', 1],
    ['1821', 3],
    ['1777', 1],
    ['1761', 1],
    ['1758', 6],
    ['Other (2)', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=294)',
    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);