3 and 11/12 + 1 and 1/4

the graph is attached.

step-by-step explanation:

using x = 0 as 2004, the y-intercept will be at (0, 62.33).  

the rainfall amounts are decreasing each year.   the amount of rainfall is decreasing at a constant amount each year:

61.8-62.33 = -0.53;

61.27-61.8 = -0.53;

60.74-61.27 = -0.53; etc.

this means the data is, in fact, linear, and the slope (rate of change) is -0.53.