function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1966', 11],
    ['1961', 6],
    ['1949', 7],
    ['1948', 6],
    ['1941', 10],
    ['1932', 6],
    ['1927', 6],
    ['1924', 6],
    ['1922', 5],
    ['1916', 33],
    ['1907', 6],
    ['1883', 5],
    ['1876', 10],
    ['1854', 50],
    ['1789', 5],
    ['Other (70)', 144]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=316)',
    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);