日期	指数 (元/吨)	涨跌
20211117	17530	-10
20211116	17540	-10
20211115	17550	0
20211112	17550	-10
20211111	17560	-10
20211110	17570	0
20211109	17570	-10
20211108	17580	-20
20211105	17600	0
20211104	17600	0
20211103	17600	0
20211102	17600	0
20211101	17600	0
20211029	17600	0
20211028	17600	-30
20211027	17630	0
20211026	17630	-20
20211025	17650	-100
20211022	17750	0
20211021	17750	0