The phrase "year decrease" refers to a reduction or decrease in something over the course of one year. It means that the quantity or value of something has become smaller compared to the previous year. Full definition
This is actually a year on year decrease of 1 %. (wccftech.com)
During the 12 years after the transition away from eating vegetarian, meat - eating was associated with a 3.6 year decrease in life expectancy. (nutritionfacts.org)
For example, a person can purchase a 20 year decreasing term policy where the premiums are locked in for that time period. (secureseniorlifeinsurance.com)