Given The rate of change is represented in this formula;
this is in 2 year
then in 1 year = (3.63+1.22x)/2
the annual rate of change=1.815+0.61x
And what do you mean by this? The rate of change "over a period of two years" does not tell us anything about what the rate of change of any shorter (or longer) period might be.However this is over a period of 2 years
What is the annual rate of change?