Solar Irradiance


I need annual solar irradiance data for the years 2012 - 2017 for Carteret, NJ or the closest location for which such data is available. I would like to compare the data to the output of a solar array my company owns in Carteret, to see if changes in output can be explained by changes in available solar irradiance. There are lots of resources on the web for this data, but I'm not sure which is best. Any thoughts?

I should require solar irradiance data 2017 to 2018 data.