function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2021', 28],
    ['2016', 22],
    ['2014', 74],
    ['2011', 19],
    ['2010', 14],
    ['2002', 14],
    ['2001', 24],
    ['1971', 14],
    ['1953', 24],
    ['1924', 13],
    ['1907', 64],
    ['1906', 14],
    ['1883', 48],
    ['1854', 15],
    ['1851', 18],
    ['Other (95)', 330]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=735)',
    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);