function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1967', 8],
    ['1960', 6],
    ['1959', 6],
    ['1958', 6],
    ['1937', 9],
    ['1936', 12],
    ['1934', 8],
    ['1929', 12],
    ['1928', 7],
    ['1913', 8],
    ['1911', 6],
    ['1872', 5],
    ['1857', 6],
    ['1850', 9],
    ['1839', 14],
    ['Other (104)', 223]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=345)',
    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);