function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2023', 93],
    ['2022', 112],
    ['2021', 39],
    ['2020', 42],
    ['2019', 172],
    ['2018', 85],
    ['2017', 40],
    ['2016', 1223],
    ['2015', 41],
    ['2013', 69],
    ['2009', 43],
    ['2007', 58],
    ['2001', 92],
    ['1839', 148],
    ['1833', 77],
    ['Other (46)', 203]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=2537)',
    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);