Productivity can simply be calculated by taking the ratio of Output over Labor Force. That is,
Sporon Calculation Productivity
Year 2012: 1,800 / 30 = 60 60
Year 2014: 2,160 / 30 = 72 72
Gobbledigook Calculation Productivity
Year 2012: 900 / 30 = 30 30
Year 2014: 1,620 / 30 = 54 54