function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2022', 7],
    ['2020', 27],
    ['2019', 39],
    ['2018', 20],
    ['2015', 9],
    ['2008', 10],
    ['2001', 12],
    ['2000', 20],
    ['1992', 24],
    ['1988', 7],
    ['1979', 17],
    ['1973', 10],
    ['1971', 6],
    ['1969', 12],
    ['1905', 11],
    ['Other (52)', 115]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=346)',
    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);