function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 18],
    ['2022', 3],
    ['2021', 10],
    ['2019', 23],
    ['2017', 10],
    ['2016', 25],
    ['2015', 22],
    ['2013', 3],
    ['2010', 3],
    ['2006', 17],
    ['1998', 4],
    ['1991', 4],
    ['1981', 6],
    ['1979', 73],
    ['1959', 10],
    ['Other (12)', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=246)',
    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);