Table:
text: Formula One sponsorship liveries
ATS
ATS
Year_ Main_colours Additional_colours Livery Additional_major_sponsors
1978 Yellow Black ATS Wheels Ford, Champion, Air Press, Shell, Goodyear
1979 Yellow Black, Red ATS Wheels, Arawak, Hotel Freeport Goodyear, Shell
1980 Yellow Black, Red ATS Wheels, Arawak, Hotel Freeport Shell, Buler Quartz, Goodyear
1981 Yellow White, Black ATS Wheels ABBA , Shell, Champion
1981 Yellow White, Black ATS Wheels Copec, Tecfin, Liqui Moly, Shell, Champion
1983 Yellow Black ATS Wheels Shell, Goodyear, Steinbock
1984 Yellow Black ATS Wheels Marilena, Steinbock, Shell, Pirelli

Question: What are the additional main sponsors corresponding to the additional color black and a year 1984 under the ATS Formula 1 sponsorship liveries?

Question: What is the average year of entries with the additional color black under ATS Formula 1 sponsorship liveries?