Chart of the day: A decade of Apple ‘computer’ sales by Philip Elmer-DeWitt @FortuneMagazine January 30, 2013, 2:05 PM EST E-mail Tweet Facebook Google Plus Linkedin Share icons Source: SplatF FORTUNE — At the end of a post analyzing the factors that led to a 22% drop (16%, by weekly stats) in Mac sales last quarter — the biggest decline in 10 years — SplatF‘s Dan Frommer offers the chart above. It’s a graph showing what a decade of Apple’s AAPL computer sales would look like if — as Steve Jobs suggested — you counted the iPad as a computer. “When we were an agrarian nation,” Jobs said in 2010, “all cars were trucks, because that’s what you needed on the farm. But as vehicles started to be used in the urban centers, cars got more popular. Innovations like automatic transmission and power steering and things that you didn’t care about in a truck as much started to become paramount in cars. … PCs are going to be like trucks. They’re still going to be around, they’re still going to have a lot of value, but they’re going to be used by one out of X people. … I think that we’re embarked on that. Is the next step the iPad? Who knows? Will it happen next year or five years from now or seven years from now? Who knows? But I think we’re headed in that direction.” Jobs could have gone one step further. If PCs are trucks and tablets are cars, maybe smartphones are motorbikes.