function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2020', 10],
    ['2019', 4],
    ['2014', 8],
    ['2001', 6],
    ['1960', 2],
    ['1953', 3],
    ['1939', 2],
    ['1919', 3],
    ['1909', 4],
    ['1907', 12],
    ['1906', 3],
    ['1902', 8],
    ['1895', 2],
    ['1883', 4],
    ['1854', 7],
    ['Other (18)', 21]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=99)',
    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);