function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1995', 2],
    ['1983', 3],
    ['1981', 2],
    ['1978', 2],
    ['1975', 2],
    ['1973', 3],
    ['1971', 2],
    ['1970', 2],
    ['1965', 2],
    ['1961', 3],
    ['1936', 3],
    ['1905', 2],
    ['1900', 3],
    ['1883', 2],
    ['1870', 2],
    ['Other (26)', 26]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=61)',
    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);