<image>(2014 Autumn • Yicheng City Midterm) Let's consider the function f(x) with a domain of [-1,5], and a part of the function values is shown in the table below. The graph of the derivative y = f'(x) is shown in the figure. 

Given the following statements about f(x):
\frac{}① The local maxima of the function f(x) are at x = 0 and x = 4;
② The function f(x) is decreasing on the interval [0,2];
③ If the maximum value of f(x) on the interval x ∈ [-1,t] is 2, then the maximum value of t is 4;
④ When 1, how many of these statements are correct? ______.