function drawChartTreatmentsPerYear() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['2018', 10],
    ['1997', 12],
    ['1996', 13],
    ['1993', 12],
    ['1990', 12],
    ['1989', 12],
    ['1986', 12],
    ['1985', 12],
    ['1982', 11],
    ['1972', 12],
    ['1970', 25],
    ['1968', 15],
    ['1964', 10],
    ['1960', 11],
    ['1940', 15],
    ['Other (72)', 268]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Year (n=462)',
    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);