Array Histogram

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//You will be given a string array on the console (single line, space-separated). Your task is to make statistics about the elements of //the array. Find out how many times each word occurs in the array. After which, sort the result by the count of occurrences in //descending order and print statistics about every word in the following format:
//{word} -> {count} times ({percentage:F2}%)

namespace Array_histogram
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] arr = Console.ReadLine().Split(' ').ToArray();
            List<string> words = new List<string>();
            List<int> occurrences = new List<int>();
            for (int i = 0; i < arr.Length; i++)
            {
                if (!words.Contains(arr[i]))
                {
                    words.Add(arr[i]);
                    occurrences.Add(1);
                }
                else
                {
                    int wordIndex = words.FindIndex(a => a == arr[i]);
                    occurrences[wordIndex]++;
                }
            }
            BubbleSort(words, occurrences);
            int sumAllOccurrences = occurrences.Sum();
            double percent = 100.0 / sumAllOccurrences;
            for (int i = 0; i < occurrences.Count; i++)
            {
                Console.WriteLine("{0} -> {1} times ({2:F2}%)", words[i], occurrences[i], (double)occurrences[i] * percent);
            }
        }
        static void BubbleSort( List<string> words, List<int> occur)
        {
            bool swapped;
            do
            {
                swapped = false;
                for (int i = 0; i < occur.Count - 1; i++)
                {
                    if (occur[i] < occur[i+1])
                    {
                        Swap(words, occur, i, i + 1);
                        swapped = true;
                    }
                }

            } while (swapped);
        }
        static void Swap(List<string> words, List<int> occur, int i1, int i2)
        {
            string tempWords = words[i1];
            int tempOccur = occur[i1];
            words[i1] = words[i2];
            occur[i1] = occur[i2];
            words[i2] = tempWords;
            occur[i2] = tempOccur;
        }
    }
}