Lumen maintenance and life expectancy of Citi cobs?

Gen 5 and 6, anyone know what kind of life they are expected to have and how they old up for output over time?

That's all on the datasheet, give it a look!

Have a look at this: http://cobkits.com/wp-content/uploads/2017/02/OLE16-0034-01_CLU056_15kh_LM-80-report.pdf

Lumen maintenance report

I must be reading the data sheets wrong because I dont see it... What page is it on?
http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_5/CLU058-1825C4_P3386_1115.pdf

It's in a report separate from the datasheets, click the link i posted before

at typical grower currents of 1750 mA or less... 90+% at 10+ years