function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1980', 2],
    ['1957', 1],
    ['1956', 1],
    ['1951', 1],
    ['1949', 1],
    ['1939', 1],
    ['1936', 1],
    ['1935', 1],
    ['1933', 1],
    ['1932', 2],
    ['1929', 2],
    ['1928', 1],
    ['1923', 1],
    ['1920', 2],
    ['1910', 1],
    ['Other (4)', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=23)',
    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);