It has risen twelve times, and then from one year to one year, from seven to five yuan in 15 to 16 years, from eight to nine yuan, from 19 to 20.
From nine mao to the current ten yuan, we can see that the price of green onions increases by about ten times every four years or so. Looking at ginger again, it is still a piece of eight in 2009.
By ten years it had risen to ten yuan, and then it rose from two yuan in one or two years to twenty yuan in four years, and about five yuan in 19 years. By mid-2020, it has reached a maximum of 17 yuan.
Ginger has risen almost once in five years, and the increase can also be five to ten times. Finally, it is the garlic with the most news and the most ferocious hype. This is the low point of 2009.
It was about fifty cents, and in 2010 it had risen to twelve yuan, which was more than twenty times higher. The cut-off is about 2.5 yuan for one to five years. After two consecutive years of rising, it reached 17 yuan in 2017.
Then it rose from one yuan to seven yuan in 2018 to about ten yuan in 19 years. The rise and fall cycle of garlic is about four years. Except for onion, ginger and garlic, there should be no other agricultural products whose prices can fluctuate so sharply.