Research on Railway Passenger Volume Forecast Based on the Spline Interpolation and IPSO-Gradient Difference Acceleration Rule

Table 1

Basic data related to railroad passenger volume in Beijing.

Year	Passenger volume (million people)	GDP (billions of RMB)	Resident population (million people)	Consumption level per capita (RMB)	Number of tourists (million people)
2000	4458	3278	1364	9835	10468
2001	4750	3862	1385	10313	11293
2002	5032	4526	1423	12380	11810
2003	4352	5267	1456	13734	8885
2004	5437	6253	1493	15328	12266
2005	5779	7150	1538	16636	12863
2006	6269	8387	1601	19003	13590
2007	6915	10426	1676	21769	14716
2008	7644	11813	1771	24005	14560
2009	8161	12901	1860	26353	16670
2010	8903	14964	1962	29483	18390
2011	9755	17189	2019	32924	21404
2012	10315	19025	2069	36028	23135
2013	11588	21135	2115	40270	25189
2014	12609	22926	2152	43008	26150
2015	12821	24779	2171	46604	27279
2016	13380	27041	2173	50301	28532
2017	13873	29883	2171	55121	29746
2018	14273	33106	2154	61429	31094
2019	14755	35371	2154	67756	32210