function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2024', 9],
    ['2009', 6],
    ['1975', 6],
    ['1970', 8],
    ['1966', 9],
    ['1965', 5],
    ['1960', 5],
    ['1959', 9],
    ['1957', 8],
    ['1952', 5],
    ['1951', 5],
    ['1941', 5],
    ['1940', 5],
    ['1939', 5],
    ['1920', 8],
    ['Other (67)', 137]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=235)',
    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);