import numpy as np
import matplotlib.pyplot as plt
from scipy.interpolate import UnivariateSpline
x = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47]
y = [31031.4,35241.7,42320.8,38146.7,38345.9,42320.8,33649.2,4