FinalEvangelion said:
DVD was the one with the fastest adoption rate - close to 70%. CD had close to 50% by 1998. Was B&W commerically available from the 1920s and color from 47?
unfortunately, I don't know the BG info on the graph, so take it as a grain of salt for now. I will try to find more
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did some reading on wikipedia now
B&W tv, the first tv's in the 1920s were electromechanical devices with a spinning wheel inside and had nothing to do with current TV's, in the laste 1930s the first cathode ray tube TVs entered market (starting in germany), but soon after WW2 started and so production was stopped again cause of war after only a few thousend TV's sold (you could theoretically count these to but then bw tv line would be really flat) so starting after ww2 is maybe not completely correct but it starts probably at the point when TVs were comercially available to broad masses.
on color tv there was the first color tv broadcast still using mechanical scanning in the late 30s, the shadow mask color TV was patented in 1938 in germany, but again ww2 stopped all a few years and it took till 1950 till there were the first programms in color and they were stopped again in 1951 to be continued with another system in 1953 in the us. so i guess 1954 is not too far off for the comercial start of color tv.