This graph shows global net marine energy capacity additions in 2017 as well as projected statistics for the years 2018 through 2023. The net expansion of maritime energy capacity is expected to reach 12 megawatts by 2022. There is sudden drop due to higher demand of fossil fuel and less of investment into marine energy.
if you prefer table format data here it is , And yes following us on twitter will be quite aquatic.
|Year||megawatts energy generation|