x = np.array(["New York", "San Francisco", "Los Angeles", "Chicago", "Miami"])
y1 = np.array([50, 63, 40, 68, 35])
y2 = np.array([77, 85, 62, 89, 58])
y3 = np.array([50, 35, 79, 43, 67])
y4 = np.array([59, 62, 33, 77, 72])