function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['1998', 2],
    ['1995', 4],
    ['1994', 4],
    ['1992', 3],
    ['1990', 2],
    ['1989', 2],
    ['1982', 4],
    ['1981', 2],
    ['1980', 5],
    ['1979', 2],
    ['1978', 9],
    ['1977', 3],
    ['1970', 9],
    ['1937', 2],
    ['1934', 2],
    ['Other (19)', 20]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=75)',
    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);