Fig.&Table1. Nominal world prices of rice, wheat, corn and soybean (Annual since 1961, $/t）
	Year	Rice	Wheat	Corn	Soybean	U.S. CPI
	1961	136.6	58.8	47.7	102.0	10.70
	1962	152.8	64.3	48.7	92.0	10.70
	1963	143.3	64.7	53.8	101.0	10.81
	1964	137.8	67.6	54.7	101.0	10.95
	1965	136.3	59.5	55.2	107.3	11.10
	1966	165.7	62.8	58.0	115.9	11.28
	1967	221.0	65.8	54.2	103.3	11.60
	1968	204.7	62.8	47.5	97.2	11.96
	1969	185.1	58.4	52.0	94.4	12.46
	1970	143.0	54.7	58.3	107.3	13.14
	1971	130.3	61.7	58.3	115.4	13.89
	1972	149.9	69.8	55.7	128.7	14.50
	1973	296.6	140.0	97.5	266.5	14.96
	1974	541.5	179.7	132.4	254.2	15.89
	1975	363.2	149.2	119.5	201.1	17.65
	1976	254.1	133.0	112.3	216.5	19.26
	1977	272.4	103.2	95.4	261.2	20.37
	1978	368.5	127.9	100.7	242.6	21.69
	1979	334.3	160.2	115.6	264.3	23.34
	1980	410.7	168.3	125.3	296.2	25.99
	1981	459.0	154.6	130.8	288.4	29.50
	1982	272.5	132.6	109.3	244.6	32.54
	1983	256.8	137.3	136.0	281.6	34.55
	1984	232.5	140.2	135.9	282.1	35.66
	1985	196.9	128.7	112.2	224.4	37.20
	1986	186.2	118.4	87.6	208.4	38.52
	1987	214.6	112.1	75.7	215.8	39.24
	1988	277.5	140.7	106.9	303.5	40.67
	1989	299.2	161.3	111.5	275.0	42.35
	1990	270.9	129.1	109.3	246.8	44.39
	1991	293.3	126.1	107.4	239.6	46.79
	1992	268.2	145.1	104.2	235.5	48.76
	1993	235.4	134.8	102.1	255.1	50.23
	1994	267.6	138.6	107.6	251.8	51.73
	1995	321.0	167.4	123.5	259.3	53.05
	1996	338.9	187.4	165.8	304.8	54.56
	1997	303.5	143.6	117.1	295.4	56.17
	1998	304.2	111.5	102.0	243.3	57.46
	1999	248.4	96.3	90.2	201.7	58.35
	2000	202.4	98.9	88.5	211.8	59.64
	2001	172.8	107.7	89.6	195.8	61.65
	2002	191.9	130.0	99.3	212.7	63.40
	2003	197.6	138.6	105.4	264.0	64.40
	2004	237.7	144.4	111.8	306.5	65.87
	2005	286.3	135.7	98.7	274.7	67.62
	2006	304.9	159.0	121.9	268.6	69.92
	2007	326.4	238.6	163.7	383.1	72.17
	2008	650.2	271.5	223.1	521.9	74.23
	2009	555.0	186.0	165.5	423.6	77.08
	2010	488.9	229.7	185.9	447.1	76.80
	2011	543.0	285.9	291.7	537.5	78.43
	2012	563.0	295.4	298.4	595.5	80.09
	2013	505.9	276.7	259.4	551.4	81.78
	2014	422.8	245.2	192.9	484.9	83.51
	2015	386.0	206.4	169.8	392.1	85.28
	2016	396.2	176.3	159.2	405.4	87.09
	2017	398.9	178.2	154.5	393.4	88.93
	2018	420.7	203.9	164.4	394.4	90.81
	2019	418.0	211.3	170.1	368.9	92.73
	2020	496.8	227.7	165.5	406.6	94.70
	2021	458.3	281.7	259.5	583.0	96.70
	2022	436.8	381.9	318.8	675.4	98.75
	2023	496.5	291.2	293.6	630.3	100.00
	Note: The annual price data are simple averages based on the monthly data for each year.