import numpy as np
import matplotlib.pyplot as plt

data = [
    [30, 25, 50, 20],  # CS
    [40, 23, 51, 17],  # IT
    [35, 22, 45, 19],  # EEE
      ]

#row = job cs, it, eee
#col = year 2018, 2019, 2020, 2021

years = ["2018", "2019", "2020", "2021"]

num_departments = len(data)
num_bars = len(data[0])
bar_width = 0.25

ind = np.arange(num_bars)

bars_CS = plt.bar(ind, data[0], width=bar_width, label="CS")
bars_IT = plt.bar(ind + bar_width, data[1], width=bar_width, label="IT")
bars_EEE = plt.bar(ind + 2 * bar_width, data[2], width=bar_width, label="EEE")

plt.xlabel("Year")
plt.ylabel("Number of NAME_1")
plt.title("Number of NAME_1 in Each Department")
plt.xticks(ind + bar_width, years)

plt.legend()

plt.show()

DO you understand this dataset? Please reply with exactly 3 paragraphs and separate each paragraph with two new lines. The very first paragraph must start with the word "service".
user