我已经成功地从数据集中提取了特定单词的计数，但是这花费了太多时间。我是并行编程的新手。 如何在以下代码中创建并行性：

df = dd.read_csv('crime.csv',encoding="ISO-8859-1")
distinct_values = df.YEAR.unique().compute()
counter = len(distinct_values)

values_count = {}

for i in distinct_values:
    count = df[df.YEAR == i].YEAR.value_counts().compute()
    values_count.update(count)
list = []
for x,y in values_count.items():
    dict = {}
    for i in x,y:
        dict['name'] = x
        dict['value'] = y
    # print(dict)
    list.append(dict)
# print(list)

maximum = max(distinct_values)
mininmum = min(distinct_values)