Chart 1. Response rates at the data collection stage per major expenditure group category in the Consumer Price Index, 2002 to 2021
Expenditure group	Food	Housing	Shelter	Apparel	Transportation	Medical care	Recreation	Education and communication	Other goods and services
2002	91.51	89.37	76.80	53.30	92.17	90.38	85.21	81.85	92.07
2003	90.81	89.20	75.94	52.26	92.61	88.90	85.12	82.08	91.84
2004	91.82	90.19	74.23	52.46	93.94	88.53	85.68	82.19	92.26
2005	91.91	89.93	73.41	53.85	92.26	82.03	85.76	81.43	92.04
2006	91.69	89.76	72.99	53.12	92.33	80.16	85.32	80.61	92.66
2007	91.02	89.95	72.55	53.20	91.77	76.99	84.14	81.21	91.57
2008	91.37	89.87	73.62	53.60	90.47	75.91	84.47	82.76	91.72
2009	91.53	87.82	73.92	50.72	86.75	70.34	78.47	83.61	89.68
2010	91.31	89.62	75.96	55.30	89.88	69.09	83.53	88.00	90.83
2011	91.43	89.67	77.99	55.78	90.60	65.36	82.64	91.04	90.52
2012	91.30	87.49	77.52	51.93	90.55	62.72	82.42	89.13	90.72
2013	89.16	84.48	75.18	52.75	88.62	58.51	80.73	87.89	88.74
2014	89.83	85.55	73.42	55.24	90.14	53.30	81.24	88.11	87.85
2015	88.60	86.80	71.80	59.80	90.90	48.00	81.20	87.40	85.90
2016	88.50	87.20	70.00	60.70	90.30	47.40	79.80	85.60	87.50
2017	87.70	85.50	69.20	59.00	88.40	49.70	79.10	85.70	87.50
2018	86.50	81.60	63.45	56.10	85.40	48.10	77.20	85.80	83.10
2019	88.00	81.70	62.46	60.60	86.00	47.20	76.80	87.10	82.30
2020	69.41	73.02	65.96	56.46	76.60	40.81	62.64	82.24	65.21
2021	74.00	74.50	63.10	62.90	71.40	36.40	67.80	81.10	62.50
Source: U.S. Bureau of Labor Statistics.