How would I average the values associated with a date from a csv file

20/04/2009  -1.271

20/04/2009  0

20/04/2009  0.247

20/04/2009  1.337

20/04/2009  -0.438

21/04/2009  -0.134

21/04/2009  -0.096

21/04/2009  -0.418

21/04/2009  0.362

20/04/2009 , 0.025

21/04/2009 , 0.071

public class SentimentScore {

private DateTime time;
private double score;


public SentimentScore(DateTime t, double s) {
    time=t;
    score=s;

}

public DateTime getTime() {
    return time;
}

public double getScore() {
    return score;
}

public class Processor {

    private String pathToFile = "C:\\Data\\scores.csv";
    private List<SentimentScore> scores;
    CSVReader reader;
    DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");

    public Processor() {

    }

    public void loadScores() throws FileNotFoundException, IOException, ParseException {

        reader = new CSVReader(new FileReader(pathToFile));

        String[] record = null;

        while ((record = reader.readNext()) != null) {
            String dateString = record[0];
            Date date = formatter.parse(dateString);
            DateTime correctDate = new DateTime(date);
            double value = Double.parseDouble(record[1]);
            SentimentScore score = new SentimentScore(correctDate, value);
            scores.add(score);

        }
    }

    public void calculateAverages()
    {
        List<SentimentScore> newScores = new ArrayList<>();
        Iterator scoreIterator = scores.iterator();
        SentimentScore temp  = (SentimentScore) scoreIterator.next();
        DateTime currentDate = temp.getTime();
        while(scoreIterator.hasNext())
        {
            SentimentScore currentRow  = (SentimentScore) scoreIterator.next();
            if(currentRow.getTime().equals(currentDate))
            {
                List<Double> values = new ArrayList<>();
                values.add(currentRow.getScore());
                double sum = 0;
                for (Double value : values)
                {
                    sum = sum + value;
                }
                double avg = sum/values.size();
                SentimentScore averagedScore = new SentimentScore(currentRow.getTime(),avg);
                newScores.add(averagedScore);

                // then parse to new csv 

            }
        }
    }
}