function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2019', 5],
    ['1990', 2],
    ['1980', 2],
    ['1973', 2],
    ['1970', 3],
    ['1964', 2],
    ['1963', 2],
    ['1962', 2],
    ['1952', 2],
    ['1942', 3],
    ['1940', 3],
    ['1937', 8],
    ['1934', 2],
    ['1928', 2],
    ['1914', 2],
    ['Other (20)', 24]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=66)',
    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);