Board of Governors of the Federal Reserve System

Percent

Year	Jan.	Feb.	Mar.	Apr.	May	June	July	Aug.	Sept.	Oct.	Nov.	Dec.
One Month Earlier
2019	45.8	43.5	47.8	43.5	50.5	53.2	47.2	59.2	47.8	39.1	57.5	50.5
2020	55.5	49.0	24.4	11.4	56.9	75.6	74.4	68.6	57.5	68.2	65.2	60.0
2021	67.2
Three Months Earlier
2019	48.5	44.1	43.8	38.8	41.8	51.2	49.2	55.9	48.5	49.8	48.5	50.5
2020	63.2	53.8	25.1	8.4	12.4	28.8	75.3	84.3	81.6	73.9	69.2	70.9
2021	75.3
Six Months Earlier
2019	51.2	45.2	42.5	35.8	40.1	43.1	37.8	47.8	46.5	46.2	50.2	49.2
2020	54.5	51.2	24.1	11.0	11.4	16.1	25.8	31.1	47.2	83.6	87.6	83.6
2021	78.6

Note: The diffusion indexes are calculated as the percentage of series that increased over the indicated span (one, three, or six months) plus one-half the percentage that were unchanged.