Your numbers are wrong. It's known that a minimum of 4.5 % this year will happen, as that is what the rest of the staff received. However, the company knows they are a few years behind giving us raises, so they have increased this to a one time 10% rise. Additionally, each future year, the minimum pay rise is 4.5%, and if the CPI is greater, so will the pay increase. Period if agreement is 6 years. This is still a rubbish deal... 20% would be fair right off the bat, and 30% would begin to make amends for the lower life expectancy due to fatigue and scuzzy air quality.