function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 4],
    ['2016', 14],
    ['2005', 4],
    ['1922', 5],
    ['1915', 4],
    ['1912', 4],
    ['1908', 8],
    ['1907', 7],
    ['1895', 4],
    ['1894', 10],
    ['1893', 8],
    ['1892', 7],
    ['1891', 12],
    ['1886', 5],
    ['1862', 6],
    ['Other (19)', 31]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=133)',
    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);