Figure 3.1: Trends for the abundance of habitat specialist butterflies in the UK, 1976 to 2022


Trends for the abundance of habitat specialist butterflies in the UK, 1976 to 2022
Year	Unsmoothed index (1976 = 100)	Smoothed index	Smoothed index lower 95% confidence interval	Smoothed index upper 95% confidence interval
1976	100.00	57.20	50.57	63.82
1977	26.55	53.05	47.64	58.46
1978	43.35	49.29	44.70	53.87
1979	40.74	46.05	41.94	50.16
1980	40.18	43.43	39.54	47.32
1981	21.23	41.49	37.68	45.30
1982	41.59	40.24	36.45	44.03
1983	36.31	39.53	35.74	43.32
1984	50.70	39.23	35.44	43.01
1985	42.85	39.16	35.38	42.93
1986	38.19	39.25	35.48	43.02
1987	44.06	39.47	35.71	43.22
1988	33.42	39.76	36.02	43.50
1989	38.82	40.13	36.40	43.86
1990	44.87	40.51	36.79	44.23
1991	35.89	40.83	37.11	44.54
1992	50.47	41.04	37.32	44.75
1993	39.08	41.08	37.36	44.79
1994	42.27	40.94	37.22	44.65
1995	46.56	40.60	36.89	44.32
1996	43.95	40.08	36.37	43.79
1997	44.87	39.41	35.70	43.12
1998	30.90	38.68	34.97	42.39
1999	33.34	38.01	34.29	41.72
2000	34.75	37.46	33.75	41.17
2001	34.04	37.06	33.35	40.77
2002	30.83	36.80	33.09	40.51
2003	38.02	36.66	32.95	40.37
2004	41.02	36.56	32.84	40.27
2005	39.45	36.42	32.71	40.13
2006	46.56	36.23	32.51	39.94
2007	30.27	35.97	32.25	39.69
2008	26.92	35.73	32.01	39.46
2009	34.36	35.56	31.83	39.29
2010	44.57	35.40	31.66	39.14
2011	44.26	35.22	31.47	38.97
2012	23.77	35.04	31.27	38.80
2013	35.32	34.96	31.18	38.74
2014	38.55	35.00	31.21	38.78
2015	33.19	35.17	31.38	38.96
2016	27.23	35.51	31.72	39.30
2017	29.99	36.05	32.24	39.86
2018	41.59	36.75	32.86	40.64
2019	42.56	37.51	33.39	41.63
2020	39.90	38.27	33.67	42.87
2021	39.26	39.03	33.59	44.46
2022	39.26	39.78	33.12	46.44

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