Average retail price and the consumer Price Index

Question

Table illustrates the average retail price of milk and the Consumer Price Index from the year 1980 to 1998.

Compute the real price of milk in the year 1980 dollars. Has the real price increased/decreased/stayed the similar since the year 1980?
Real price of milk in year X =CPI₁₉₈₀ /CPI _year X nominal price in year 1980

                    1980 $1.05        1985 $0.86            1990 $0.88     1995 $0.80  1998 $0.81

Since 1980 the real price of milk has reduced.