function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2014', 6],
    ['2001', 5],
    ['1999', 2],
    ['1997', 2],
    ['1994', 3],
    ['1993', 3],
    ['1992', 3],
    ['1991', 4],
    ['1990', 3],
    ['1988', 5],
    ['1986', 7],
    ['1974', 4],
    ['1964', 6],
    ['1942', 3],
    ['1922', 9],
    ['Other (8)', 9]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=74)',
    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);